Drop Qt 4 support

2024-11-25 10:46:15 +03:00 · 2017-01-19 13:10:09 +01:00 · 2017-01-19 13:10:09 +01:00 · e64bb1de8c
commit e64bb1de8c
parent 60998a68eb
67 changed files with 48 additions and 8809 deletions
--- a/.travis.yml
+++ b/.travis.yml
@ -12,17 +12,9 @@ env:
    #- lt_branch=dist gui=false
    - lt_branch=RC_1_0 qt=5 gui=true
    - lt_branch=RC_1_0 qt=5 gui=false
-    - lt_branch=RC_1_0 qt=4 gui=true
-    - lt_branch=RC_1_0 qt=4 gui=false
  global:
    - secure: "OI9CUjj4lTb0HwwIZU5PbECU3hLlAL6KC8KsbwohG8/O3j5fLcnmDsK4Ad9us5cC39sS11Jcd1kDP2qRcCuST/glVNhLkcjKkiQerOfd5nQ/qL4JYfz/1mfP5mdpz9jHKzpLUIG+TXkbSTjP6VVmsb5KPT+3pKEdRFZB+Pu9+J8="
    - coverity_branch: coverity_scan
-matrix:
-  allow_failures:
-    - os: osx
-      env: lt_branch=RC_1_0 qt=4 gui=true
-    - os: osx
-      env: lt_branch=RC_1_0 qt=4 gui=false

 branches:
  except:
@ -79,7 +71,7 @@ before_install:
  #- libt_path="$HOME/libt_install"
  #- ltconf="$ltconf --prefix="$libt_path" --disable-geoip"
  - qbt_path="$HOME/qbt_install"
-  - qbtconf="$qbtconf --prefix="$qbt_path" PKG_CONFIG_PATH="$libt_path/lib/pkgconfig":$PKG_CONFIG_PATH"
+  - qbtconf="$qbtconf --prefix="$qbt_path" PKG_CONFIG_PATH="$libt_path/lib/pkgconfig":/opt/qt55/lib/pkgconfig:$PKG_CONFIG_PATH"

  # options for specific branches
  - if [ "$qt" = 4 ]; then qbtconf="$qbtconf --with-qt4" ; fi
@ -88,6 +80,9 @@ before_install:
    if [ "$TRAVIS_OS_NAME" = "linux" ]; then
      # setup virtual display for after_success target
      if [ "$gui" = true ]; then export "DISPLAY=:99.0" && /sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -ac -screen 0 1280x1024x16 ; fi ;
+
+      # Qt 5
+      PATH=/opt/qt55/bin:${PATH}
    fi
  - |
    if [ "$TRAVIS_OS_NAME" = "osx" ]; then
@ -103,21 +98,23 @@ before_install:
 install:
  - |
    if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-      # libtorrent
+      # repositories
      sudo add-apt-repository --yes ppa:qbittorrent-team/qbittorrent-stable ;
+      sudo add-apt-repository --yes ppa:beineri/opt-qt551-trusty ;
      sudo apt-get update -qq ;
+
+      # libtorrent
      sudo apt-get install -qq libtorrent-rasterbar-dev ;

+      # Qt 5.5.1
+      sudo apt-get install -qq qt55base qt55tools ;
+
      # build libtorrent from source
      #if [ "$lt_branch" != "dist" ]; then
        #cd "$HOME" && pwd && git clone --depth 1 https://github.com/arvidn/libtorrent.git --branch $lt_branch ;
        #cd libtorrent && ./autotool.sh && ./configure $ltconf && make install ;
      #fi ;

-      # Qt
-      if [ "$qt" = 4 ]; then sudo apt-get -qq install qt4-default libqt4-dev ; fi ;
-      if [ "$qt" = 5 ]; then sudo apt-get -qq install qt5-default qtbase5-dev qttools5-dev-tools ; fi ;
-
      # ccache
      if [ "$TRAVIS_BRANCH" != "$coverity_branch" ]; then
        dpkg-query -L ccache && export use_ccache=true ;
@ -151,15 +148,12 @@ install:
      brew install "$HOME/hombebrew_cache/libtorrent-rasterbar.rb" ;

      # Qt
-      if [ "$qt" = 4 ]; then brew install qt && ln -s /usr/local/Cellar/qt/4.8.7_2/plugins /usr/local ; fi ;
-      if [ "$qt" = 5 ]; then
      # Copy custom qt5 bottle to homebrew's cache so it can find and install it
      # Also install our custom qt5 formula by passing the local path to it
      # These 2 files are restored from Travis' cache.
      cp "$HOME/hombebrew_cache/qt5-5.7.1_1.el_capitan.bottle.tar.gz" "$(brew --cache)" ;
      brew install "$HOME/hombebrew_cache/qt5.rb" ;
      brew link --force qt5 ;
-      fi

      # ccache
      if [ "$TRAVIS_BRANCH" != "$coverity_branch" ]; then
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -40,11 +40,8 @@ endif(WIN32)
 # we need options here, because they are used not only in "src" subdir, but in the "dist" dir too
 include(CMakeDependentOption)

-option(QT5 "Compile using Qt5" ON)
 option(SYSTEM_QTSINGLEAPPLICATION
    "Use the system qtsingleapplication library or shipped one otherwise")
-cmake_dependent_option(SYSTEM_QJSON
-    "Use the shipped qjson library or the system one (Qt4 only)" OFF "NOT QT5" OFF)

 option(GUI "Allows to disable GUI for headless running. Disables QtDBus and the GeoIP Database" ON)

--- a/277
+++ b/277
@ -603,8 +603,6 @@ zlib_LIBS
 zlib_CFLAGS
 libtorrent_LIBS
 libtorrent_CFLAGS
-qjson_LIBS
-qjson_CFLAGS
 BOOST_SYSTEM_LIB
 BOOST_LDFLAGS
 BOOST_CPPFLAGS
@ -690,7 +688,6 @@ infodir
 docdir
 oldincludedir
 includedir
-runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@ -715,9 +712,7 @@ ac_user_opts='
 enable_option_checking
 enable_dependency_tracking
 enable_silent_rules
-with_qt4
 with_qtsingleapplication
-with_qjson
 enable_debug
 enable_gui
 enable_systemd
@ -742,8 +737,6 @@ PKG_CONFIG
 PKG_CONFIG_PATH
 PKG_CONFIG_LIBDIR
 QT_QMAKE
-qjson_CFLAGS
-qjson_LIBS
 libtorrent_CFLAGS
 libtorrent_LIBS
 zlib_CFLAGS
@ -786,7 +779,6 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
-runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@ -1039,15 +1031,6 @@ do
  | -silent | --silent | --silen | --sile | --sil)
    silent=yes ;;

-  -runstatedir | --runstatedir | --runstatedi | --runstated \
-  | --runstate | --runstat | --runsta | --runst | --runs \
-  | --run | --ru | --r)
-    ac_prev=runstatedir ;;
-  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
-  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
-  | --run=* | --ru=* | --r=*)
-    runstatedir=$ac_optarg ;;
-
  -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
    ac_prev=sbindir ;;
  -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@ -1185,7 +1168,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir runstatedir
+		libdir localedir mandir
 do
  eval ac_val=\$$ac_var
  # Remove trailing slashes.
@ -1338,7 +1321,6 @@ Fine tuning of the installation directories:
  --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
  --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
  --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
-  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
  --libdir=DIR            object code libraries [EPREFIX/lib]
  --includedir=DIR        C header files [PREFIX/include]
  --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@ -1393,13 +1375,9 @@ Optional Features:
 Optional Packages:
  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
-  --with-qt4              Compile using Qt4 (default=no)
  --with-qtsingleapplication=[system|shipped]
                          Use the shipped qtsingleapplication library or the
                          system one (default=shipped)
-  --with-qjson=[system|shipped]
-                          Use the shipped qjson library or the system one
-                          (default=shipped) (Qt4 only)
  --with-boost[=ARG]      use Boost library from a standard location
                          (ARG=yes), from the specified location (ARG=<path>),
                          or disable it (ARG=no) [ARG=yes]
@ -1430,9 +1408,6 @@ Some influential environment variables:
  PKG_CONFIG_LIBDIR
              path overriding pkg-config's built-in search path
  QT_QMAKE    value of host_bins for Qt5Core >= 5.2.0, overriding pkg-config
-  qjson_CFLAGS
-              C compiler flags for qjson, overriding pkg-config
-  qjson_LIBS  linker flags for qjson, overriding pkg-config
  libtorrent_CFLAGS
              C compiler flags for libtorrent, overriding pkg-config
  libtorrent_LIBS
@ -4179,15 +4154,6 @@ fi
 # Define --wth-* and --enable-* arguments


-# Check whether --with-qt4 was given.
-if test "${with_qt4+set}" = set; then :
-  withval=$with_qt4;
-else
-  with_qt4=no
-fi
-
-
-
 # Check whether --with-qtsingleapplication was given.
 if test "${with_qtsingleapplication+set}" = set; then :
  withval=$with_qtsingleapplication;
@ -4196,15 +4162,6 @@ else
 fi


-
-# Check whether --with-qjson was given.
-if test "${with_qjson+set}" = set; then :
-  withval=$with_qjson;
-else
-  with_qjson=shipped
-fi
-
-
 # Check whether --enable-debug was given.
 if test "${enable_debug+set}" = set; then :
  enableval=$enable_debug;
@ -4466,13 +4423,7 @@ $as_echo "$enable_webui" >&6; }
        as_fn_error $? "Unknown option \"$enable_webui\". Use either \"yes\" or \"no\"." "$LINENO" 5 ;;
 esac

-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether Qt4 should be enabled" >&5
-$as_echo_n "checking whether Qt4 should be enabled... " >&6; }
-case "x$with_qt4" in #(
-  "xno") :
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-              if test -n "$PKG_CONFIG" && \
+if test -n "$PKG_CONFIG" && \
    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"Qt5Core >= 5.2.0\""; } >&5
  ($PKG_CONFIG --exists --print-errors "Qt5Core >= 5.2.0") 2>&5
  ac_status=$?
@ -4524,97 +4475,6 @@ else
  { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
 $as_echo "not found" >&6; }

-fi
- ;; #(
-  "xyes") :
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-               if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"QtCore >= 4.8.0\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "QtCore >= 4.8.0") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; then
-
-if test -n "$QT_QMAKE"; then
-    pkg_cv_QT_QMAKE="$QT_QMAKE"
- elif test -n "$PKG_CONFIG"; then
-    if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"QtCore >= 4.8.0\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "QtCore >= 4.8.0") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; then
-  pkg_cv_QT_QMAKE=`$PKG_CONFIG --variable="moc_location" "QtCore >= 4.8.0" 2>/dev/null`
-		      test "x$?" != "x0" && pkg_failed=yes
-else
-  pkg_failed=yes
-fi
- else
-    pkg_failed=untried
-fi
-QT_QMAKE=$pkg_cv_QT_QMAKE
-
-if test "x$QT_QMAKE" = x""; then :
-
-else
-  QT_QMAKE=`$as_dirname -- "$QT_QMAKE" ||
-$as_expr X"$QT_QMAKE" : 'X\(.*[^/]\)//*[^/][^/]*/*$' \| \
-	 X"$QT_QMAKE" : 'X\(//\)[^/]' \| \
-	 X"$QT_QMAKE" : 'X\(//\)$' \| \
-	 X"$QT_QMAKE" : 'X\(/\)' \| . 2>/dev/null ||
-$as_echo X"$QT_QMAKE" |
-    sed '/^X\(.*[^/]\)\/\/*[^/][^/]*\/*$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)[^/].*/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\/\)$/{
-	    s//\1/
-	    q
-	  }
-	  /^X\(\/\).*/{
-	    s//\1/
-	    q
-	  }
-	  s/.*/./; q'`
-fi
-
-fi
-
-if test -f "$QT_QMAKE/qmake"; then :
-  QT_QMAKE="$QT_QMAKE/qmake"
-else
-  if test -f "$QT_QMAKE/qmake-qt4"; then :
-  QT_QMAKE="$QT_QMAKE/qmake-qt4"
-else
-  QT_QMAKE=""
-fi
-
-fi
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for Qt4 qmake >= 4.8.0" >&5
-$as_echo_n "checking for Qt4 qmake >= 4.8.0... " >&6; }
-if test "x$QT_QMAKE" != "x"; then :
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $QT_QMAKE" >&5
-$as_echo "$QT_QMAKE" >&6; }
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
-$as_echo "not found" >&6; }
-
-fi
- ;; #(
-  *) :
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_qt4" >&5
-$as_echo "$with_qt4" >&6; }
-        as_fn_error $? "Unknown option \"$with_qt4\". Use either \"yes\" or \"no\"." "$LINENO" 5 ;;
-esac
-if test "x$QT_QMAKE" = "x"; then :
-  as_fn_error $? "Could not find qmake" "$LINENO" 5
-
 fi

 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether QtDBus should be enabled" >&5
@ -4623,7 +4483,6 @@ case "x$enable_qt_dbus" in #(
  "xyes") :
    { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
-               if test "x$with_qt4" = "xno"; then :
               { $as_echo "$as_me:${as_lineno-$LINENO}: checking for Qt5DBus >= 5.2.0" >&5
 $as_echo_n "checking for Qt5DBus >= 5.2.0... " >&6; }
       if test -n "$PKG_CONFIG" && \
@ -4639,26 +4498,6 @@ else
  { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
 $as_echo "not found" >&6; }
                         HAVE_QTDBUS=false
-fi
-
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for QtDBus >= 4.8.0" >&5
-$as_echo_n "checking for QtDBus >= 4.8.0... " >&6; }
-       if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"QtDBus >= 4.8.0\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "QtDBus >= 4.8.0") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: found" >&5
-$as_echo "found" >&6; }
-                         HAVE_QTDBUS=true
-else
-  { $as_echo "$as_me:${as_lineno-$LINENO}: result: not found" >&5
-$as_echo "not found" >&6; }
-                         HAVE_QTDBUS=false
-fi
-
 fi

               if test "x$HAVE_QTDBUS" = "xfalse"; then :
@ -5247,118 +5086,6 @@ $as_echo "$with_qtsingleapplication" >&6; }
        as_fn_error $? "Unknown option \"$with_qtsingleapplication\". Use either \"system\" or \"shipped\"." "$LINENO" 5 ;;
 esac

-if test "x$with_qt4" = "xyes"; then :
-  { $as_echo "$as_me:${as_lineno-$LINENO}: checking which qjson to use" >&5
-$as_echo_n "checking which qjson to use... " >&6; }
-      case "x$with_qjson" in #(
-  "xshipped") :
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: shipped" >&5
-$as_echo "shipped" >&6; }
-                         QBT_REMOVE_CONFIG="$QBT_REMOVE_CONFIG usesystemqjson" ;; #(
-  "xsystem") :
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: system" >&5
-$as_echo "system" >&6; }
-
-pkg_failed=no
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for qjson" >&5
-$as_echo_n "checking for qjson... " >&6; }
-
-if test -n "$qjson_CFLAGS"; then
-    pkg_cv_qjson_CFLAGS="$qjson_CFLAGS"
- elif test -n "$PKG_CONFIG"; then
-    if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"QJson >= 0.8.1\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "QJson >= 0.8.1") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; then
-  pkg_cv_qjson_CFLAGS=`$PKG_CONFIG --cflags "QJson >= 0.8.1" 2>/dev/null`
-		      test "x$?" != "x0" && pkg_failed=yes
-else
-  pkg_failed=yes
-fi
- else
-    pkg_failed=untried
-fi
-if test -n "$qjson_LIBS"; then
-    pkg_cv_qjson_LIBS="$qjson_LIBS"
- elif test -n "$PKG_CONFIG"; then
-    if test -n "$PKG_CONFIG" && \
-    { { $as_echo "$as_me:${as_lineno-$LINENO}: \$PKG_CONFIG --exists --print-errors \"QJson >= 0.8.1\""; } >&5
-  ($PKG_CONFIG --exists --print-errors "QJson >= 0.8.1") 2>&5
-  ac_status=$?
-  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
-  test $ac_status = 0; }; then
-  pkg_cv_qjson_LIBS=`$PKG_CONFIG --libs "QJson >= 0.8.1" 2>/dev/null`
-		      test "x$?" != "x0" && pkg_failed=yes
-else
-  pkg_failed=yes
-fi
- else
-    pkg_failed=untried
-fi
-
-
-
-if test $pkg_failed = yes; then
-   	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-
-if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
-        _pkg_short_errors_supported=yes
-else
-        _pkg_short_errors_supported=no
-fi
-        if test $_pkg_short_errors_supported = yes; then
-	        qjson_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "QJson >= 0.8.1" 2>&1`
-        else
-	        qjson_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "QJson >= 0.8.1" 2>&1`
-        fi
-	# Put the nasty error message in config.log where it belongs
-	echo "$qjson_PKG_ERRORS" >&5
-
-	as_fn_error $? "Package requirements (QJson >= 0.8.1) were not met:
-
-$qjson_PKG_ERRORS
-
-Consider adjusting the PKG_CONFIG_PATH environment variable if you
-installed software in a non-standard prefix.
-
-Alternatively, you may set the environment variables qjson_CFLAGS
-and qjson_LIBS to avoid the need to call pkg-config.
-See the pkg-config man page for more details." "$LINENO" 5
-elif test $pkg_failed = untried; then
-     	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
-$as_echo "no" >&6; }
-	{ { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
-$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
-as_fn_error $? "The pkg-config script could not be found or is too old.  Make sure it
-is in your PATH or set the PKG_CONFIG environment variable to the full
-path to pkg-config.
-
-Alternatively, you may set the environment variables qjson_CFLAGS
-and qjson_LIBS to avoid the need to call pkg-config.
-See the pkg-config man page for more details.
-
-To get pkg-config, see <http://pkg-config.freedesktop.org/>.
-See \`config.log' for more details" "$LINENO" 5; }
-else
-	qjson_CFLAGS=$pkg_cv_qjson_CFLAGS
-	qjson_LIBS=$pkg_cv_qjson_LIBS
-        { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
-$as_echo "yes" >&6; }
-	CPPFLAGS="$qjson_CFLAGS $CPPFLAGS"
-                                          LIBS="$qjson_LIBS $LIBS"
-fi
-                         QBT_ADD_CONFIG="$QBT_ADD_CONFIG usesystemqjson" ;; #(
-  *) :
-    { $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_qjson" >&5
-$as_echo "$with_qjson" >&6; }
-              as_fn_error $? "Unknown option \"$with_qjson\". Use either \"system\" or \"shipped\"." "$LINENO" 5 ;;
-esac
-
-fi
-

 pkg_failed=no
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for libtorrent" >&5
--- a/configure.ac
+++ b/configure.ac
@ -12,24 +12,12 @@ AM_INIT_AUTOMAKE

 # Define --wth-* and --enable-* arguments

-AC_ARG_WITH(qt4,
-            [AS_HELP_STRING([--with-qt4],
-                            [Compile using Qt4 (default=no)])],
-            [],
-            [with_qt4=no])
-
 AC_ARG_WITH(qtsingleapplication,
            [AS_HELP_STRING([--with-qtsingleapplication=@<:@system|shipped@:>@],
                            [Use the shipped qtsingleapplication library or the system one (default=shipped)])],
            [],
            [with_qtsingleapplication=shipped])

-AC_ARG_WITH(qjson,
-            [AS_HELP_STRING([--with-qjson=@<:@system|shipped@:>@],
-                            [Use the shipped qjson library or the system one (default=shipped) (Qt4 only)])],
-            [],
-            [with_qjson=shipped])
-
 AC_ARG_ENABLE(debug,
              [AS_HELP_STRING([--enable-debug],
                              [Enable debug build])],
@ -127,20 +115,7 @@ AS_CASE(["x$enable_webui"],
        [AC_MSG_RESULT([$enable_webui])
        AC_MSG_ERROR([Unknown option "$enable_webui". Use either "yes" or "no".])])

-AC_MSG_CHECKING([whether Qt4 should be enabled])
-AS_CASE(["x$with_qt4"],
-        ["xno"],
-              [AC_MSG_RESULT([no])
-              FIND_QT5()],
-        ["xyes"],
-               [AC_MSG_RESULT([yes])
-               FIND_QT4()],
-        [AC_MSG_RESULT([$with_qt4])
-        AC_MSG_ERROR([Unknown option "$with_qt4". Use either "yes" or "no".])])
-AS_IF([test "x$QT_QMAKE" = "x"],
-      [AC_MSG_ERROR([Could not find qmake])
-      ])
-
+FIND_QT5()
 AC_MSG_CHECKING([whether QtDBus should be enabled])
 AS_CASE(["x$enable_qt_dbus"],
        ["xyes"],
@ -185,23 +160,6 @@ AS_CASE(["x$with_qtsingleapplication"],
        [AC_MSG_RESULT([$with_qtsingleapplication])
        AC_MSG_ERROR([Unknown option "$with_qtsingleapplication". Use either "system" or "shipped".])])

-AS_IF([test "x$with_qt4" = "xyes"],
-      [AC_MSG_CHECKING([which qjson to use])
-      AS_CASE(["x$with_qjson"],
-              ["xshipped"],
-                         [AC_MSG_RESULT([shipped])
-                         QBT_REMOVE_CONFIG="$QBT_REMOVE_CONFIG usesystemqjson"],
-              ["xsystem"],
-                         [AC_MSG_RESULT([system])
-                         PKG_CHECK_MODULES(qjson,
-                                          [QJson >= 0.8.1],
-                                          [CPPFLAGS="$qjson_CFLAGS $CPPFLAGS"
-                                          LIBS="$qjson_LIBS $LIBS"])
-                         QBT_ADD_CONFIG="$QBT_ADD_CONFIG usesystemqjson"],
-              [AC_MSG_RESULT([$with_qjson])
-              AC_MSG_ERROR([Unknown option "$with_qjson". Use either "system" or "shipped".])])
-     ])
-
 PKG_CHECK_MODULES(libtorrent,
                  [libtorrent-rasterbar >= 1.0.6],
                  [CPPFLAGS="$libtorrent_CFLAGS $CPPFLAGS"
--- a/m4/qbittorrent.m4
+++ b/m4/qbittorrent.m4
@ -1,31 +1,6 @@
 # Checking for pkg-config. If found, check for QtCore and query pkg-config
 # for its exec-prefix variable.

-# FIND_QT4()
-# Sets the QT_QMAKE variable to the path of Qt4 qmake if found.
-# --------------------------------------
-AC_DEFUN([FIND_QT4],
-[PKG_CHECK_EXISTS([QtCore >= 4.8.0],
-                 [PKG_CHECK_VAR(QT_QMAKE,
-                                [QtCore >= 4.8.0],
-                                [moc_location],
-                                [QT_QMAKE=`AS_DIRNAME(["$QT_QMAKE"])`])
-                 ])
-
-AS_IF([test -f "$QT_QMAKE/qmake"],
-              [QT_QMAKE="$QT_QMAKE/qmake"],
-              [AS_IF([test -f "$QT_QMAKE/qmake-qt4"],
-                             [QT_QMAKE="$QT_QMAKE/qmake-qt4"],
-                             [QT_QMAKE=""])
-              ])
-
-AC_MSG_CHECKING([for Qt4 qmake >= 4.8.0])
-AS_IF([test "x$QT_QMAKE" != "x"],
-      [AC_MSG_RESULT([$QT_QMAKE])],
-      [AC_MSG_RESULT([not found])]
-      )
-])
-
 # FIND_QT5()
 # Sets the QT_QMAKE variable to the path of Qt5 qmake if found.
 # --------------------------------------
@ -54,19 +29,10 @@ AS_IF([test "x$QT_QMAKE" != "x"],
 # Sets the HAVE_QTDBUS variable to true or false.
 # --------------------------------------
 AC_DEFUN([FIND_QTDBUS],
-[AS_IF([test "x$with_qt4" = "xno"],
       [AC_MSG_CHECKING([for Qt5DBus >= 5.2.0])
       PKG_CHECK_EXISTS([Qt5DBus >= 5.2.0],
                        [AC_MSG_RESULT([found])
                         HAVE_QTDBUS=[true]],
                        [AC_MSG_RESULT([not found])
                         HAVE_QTDBUS=[false]])
-       ],
-       [AC_MSG_CHECKING([for QtDBus >= 4.8.0])
-       PKG_CHECK_EXISTS([QtDBus >= 4.8.0],
-                        [AC_MSG_RESULT([found])
-                         HAVE_QTDBUS=[true]],
-                        [AC_MSG_RESULT([not found])
-                         HAVE_QTDBUS=[false]])
-       ])
 ])
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@ -8,27 +8,15 @@ include(QbtTargetSources)
 find_package(LibtorrentRasterbar REQUIRED)

 # Qt
-if (QT5)
-    add_definitions(-DQBT_USES_QT5)
-    list(APPEND QBT_QT_COMPONENTS Core Network Xml)
-    if (GUI)
+list(APPEND QBT_QT_COMPONENTS Core Network Xml)
+if (GUI)
    list (APPEND QBT_QT_COMPONENTS Concurrent Gui Widgets)
-    endif (GUI)
-    if (DBUS)
+endif (GUI)
+if (DBUS)
    list (APPEND QBT_QT_COMPONENTS DBus)
-    endif (DBUS)
-    find_package(Qt5 5.2.0 COMPONENTS ${QBT_QT_COMPONENTS} REQUIRED)
-else (QT5)
-    list(APPEND QBT_QT_COMPONENTS QtCore QtNetwork QtXml)
-    if (GUI)
-        list (APPEND QBT_QT_COMPONENTS QtGui)
-    endif (GUI)
-    if (DBUS)
-        list (APPEND QBT_QT_COMPONENTS QtDBus)
-    endif (DBUS)
-    find_package(Qt4 4.8.0 COMPONENTS ${QBT_QT_COMPONENTS} REQUIRED)
-    include(${QT_USE_FILE})
-endif (QT5)
+endif (DBUS)
+find_package(Qt5 5.2.0 COMPONENTS ${QBT_QT_COMPONENTS} REQUIRED)
+

 set(CMAKE_AUTOMOC True)
 list(APPEND CMAKE_AUTORCC_OPTIONS -compress 9 -threshold 5)
--- a/src/app/CMakeLists.txt
+++ b/src/app/CMakeLists.txt
@ -17,12 +17,8 @@ file(GLOB QBT_TS_FILES ../lang/*.ts)
 get_filename_component(QBT_QM_FILES_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}/../lang" ABSOLUTE)
 set_source_files_properties(${QBT_TS_FILES} PROPERTIES OUTPUT_LOCATION "${QBT_QM_FILES_BINARY_DIR}")

-if (QT5)
-    find_package(Qt5 COMPONENTS LinguistTools REQUIRED)
-    qt5_add_translation(QBT_QM_FILES ${QBT_TS_FILES})
-else (QT5)
-    qt4_add_translation(QBT_QM_FILES ${QBT_TS_FILES})
-endif (QT5)
+find_package(Qt5 COMPONENTS LinguistTools REQUIRED)
+qt5_add_translation(QBT_QM_FILES ${QBT_TS_FILES})

 get_filename_component(_lang_qrc_src "${CMAKE_CURRENT_SOURCE_DIR}/../lang.qrc" ABSOLUTE)
 get_filename_component(_lang_qrc_dst "${CMAKE_CURRENT_BINARY_DIR}/../lang.qrc" ABSOLUTE)
--- a/src/app/application.cpp
+++ b/src/app/application.cpp
@ -114,9 +114,7 @@ Application::Application(const QString &id, int &argc, char **argv)
    setApplicationName("qBittorrent");
    initializeTranslation();
 #ifndef DISABLE_GUI
-#ifdef QBT_USES_QT5
    setAttribute(Qt::AA_UseHighDpiPixmaps, true);  // opt-in to the high DPI pixmap support
-#endif // QBT_USES_QT5
    setQuitOnLastWindowClosed(false);
 #ifdef Q_OS_WIN
    connect(this, SIGNAL(commitDataRequest(QSessionManager &)), this, SLOT(shutdownCleanup(QSessionManager &)), Qt::DirectConnection);
@ -514,14 +512,12 @@ void Application::initializeTranslation()
    QString localeStr = pref->getLocale();
    QLocale::setDefault(QLocale(localeStr));

-    if (
-#ifdef QBT_USES_QT5
-        m_qtTranslator.load(QString::fromUtf8("qtbase_") + localeStr, QLibraryInfo::location(QLibraryInfo::TranslationsPath)) ||
-#endif
+    if (m_qtTranslator.load(QString::fromUtf8("qtbase_") + localeStr, QLibraryInfo::location(QLibraryInfo::TranslationsPath)) ||
        m_qtTranslator.load(QString::fromUtf8("qt_") + localeStr, QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
            qDebug("Qt %s locale recognized, using translation.", qPrintable(localeStr));
    else
        qDebug("Qt %s locale unrecognized, using default (en).", qPrintable(localeStr));
+
    installTranslator(&m_qtTranslator);

    if (m_translator.load(QString::fromUtf8(":/lang/qbittorrent_") + localeStr))
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@ -42,11 +42,7 @@
 #include <QSplashScreen>
 #ifdef QBT_STATIC_QT
 #include <QtPlugin>
-#ifdef QBT_USES_QT5
 Q_IMPORT_PLUGIN(QICOPlugin)
-#else
-Q_IMPORT_PLUGIN(qico)
-#endif
 #endif // QBT_STATIC_QT

 #else
@ -225,7 +221,7 @@ int main(int argc, char *argv[])
        return EXIT_SUCCESS;
    }

-#if defined(Q_OS_WIN) && defined(QBT_USES_QT5)
+#if defined(Q_OS_WIN)
    // This affects only Windows apparently and Qt5.
    // When QNetworkAccessManager is instantiated it regularly starts polling
    // the network interfaces to see what's available and their status.
--- a/src/app/qtsingleapplication/CMakeLists.txt
+++ b/src/app/qtsingleapplication/CMakeLists.txt
@ -18,19 +18,10 @@ endif (GUI)

 add_library(qtsingleapplication ${QBT_QTSINGLEAPPLICATION_HEADERS} ${QBT_QTSINGLEAPPLICATION_SOURCES})
 target_include_directories(qtsingleapplication INTERFACE "${qtsingleapplication_SOURCE_DIR}")
-
-if (QT4_FOUND)
-    target_link_libraries(qtsingleapplication Qt4::QtNetwork)
-else (QT4_FOUND)
-    target_link_libraries(qtsingleapplication Qt5::Network)
-endif (QT4_FOUND)
+target_link_qt_components(qtsingleapplication Network)

 if (GUI)
-    if (QT4_FOUND)
-        target_link_libraries(qtsingleapplication Qt4::QtGui)
-    else (QT4_FOUND)
-        target_link_libraries(qtsingleapplication Qt5::Widgets)
-    endif(QT4_FOUND)
+    target_link_qt_components(qtsingleapplication Widgets)
 endif (GUI)

 add_library(QtSingleApplication::QtSingleApplication ALIAS qtsingleapplication)
--- a/src/base/CMakeLists.txt
+++ b/src/base/CMakeLists.txt
@ -121,15 +121,10 @@ tristatebool.cpp
 add_library(qbt_base STATIC ${QBT_BASE_HEADERS} ${QBT_BASE_SOURCES})
 target_link_libraries(qbt_base PRIVATE ZLIB::ZLIB PUBLIC LibtorrentRasterbar::LibTorrent)
 target_link_qt_components(qbt_base PUBLIC Core Network Xml)
-if (QT4_FOUND)
-    if (GUI)
-        target_link_libraries(qbt_base PUBLIC Qt4::QtGui)
-    endif (GUI)
-else (QT4_FOUND)
-    if (GUI)
+
+if (GUI)
    target_link_libraries(qbt_base PUBLIC Qt5::Gui Qt5::Widgets)
-    endif (GUI)
-endif (QT4_FOUND)
+endif (GUI)

 if (DBUS)
    target_link_qt_components(qbt_base PRIVATE DBus)
--- a/src/base/bittorrent/private/resumedatasavingmanager.cpp
+++ b/src/base/bittorrent/private/resumedatasavingmanager.cpp
@ -27,11 +27,7 @@
 */

 #include <QDebug>
-#ifdef QBT_USES_QT5
 #include <QSaveFile>
-#else
-#include <QFile>
-#endif

 #include "base/logger.h"
 #include "base/utils/fs.h"
@ -48,18 +44,12 @@ void ResumeDataSavingManager::saveResumeData(QString infoHash, QByteArray data)
    QString filepath = m_resumeDataDir.absoluteFilePath(filename);

    qDebug() << "Saving resume data in" << filepath;
-#ifdef QBT_USES_QT5
    QSaveFile resumeFile(filepath);
-#else
-    QFile resumeFile(filepath);
-#endif
    if (resumeFile.open(QIODevice::WriteOnly)) {
        resumeFile.write(data);
-#ifdef QBT_USES_QT5
        if (!resumeFile.commit()) {
            Logger::instance()->addMessage(QString("Couldn't save resume data in %1. Error: %2")
                                           .arg(filepath).arg(resumeFile.errorString()), Log::WARNING);
        }
-#endif
    }
 }
--- a/src/base/http/requestparser.cpp
+++ b/src/base/http/requestparser.cpp
@ -31,9 +31,7 @@

 #include <QStringList>
 #include <QUrl>
-#ifdef QBT_USES_QT5
 #include <QUrlQuery>
-#endif
 #include <QDir>
 #include <QDebug>
 #include "requestparser.h"
@ -121,11 +119,7 @@ bool RequestParser::parseStartingLine(const QString &line)
        m_request.path = url.path(); // Path

        // Parse GET parameters
-#ifndef QBT_USES_QT5
-        QListIterator<QPair<QString, QString> > i(url.queryItems());
-#else
        QListIterator<QPair<QString, QString> > i(QUrlQuery(url).queryItems());
-#endif
        while (i.hasNext()) {
            QPair<QString, QString> pair = i.next();
            m_request.gets[pair.first] = pair.second;
@ -220,13 +214,8 @@ bool RequestParser::parseContent(const QByteArray& data)
    // Parse url-encoded POST data
    if (m_request.headers["content-type"].startsWith("application/x-www-form-urlencoded")) {
        QUrl url;
-#ifndef QBT_USES_QT5
-        url.setEncodedQuery(data);
-        QListIterator<QPair<QString, QString> > i(url.queryItems());
-#else
        url.setQuery(data);
        QListIterator<QPair<QString, QString> > i(QUrlQuery(url).queryItems(QUrl::FullyDecoded));
-#endif
        while (i.hasNext()) {
            QPair<QString, QString> pair = i.next();
            m_request.posts[pair.first.toLower()] = pair.second;
--- a/src/base/http/server.cpp
+++ b/src/base/http/server.cpp
@ -76,11 +76,7 @@ void Server::disableHttps()
 }
 #endif

-#ifdef QBT_USES_QT5
 void Server::incomingConnection(qintptr socketDescriptor)
-#else
-void Server::incomingConnection(int socketDescriptor)
-#endif
 {
    QTcpSocket *serverSocket;
 #ifndef QT_NO_OPENSSL
@ -95,11 +91,7 @@ void Server::incomingConnection(int socketDescriptor)
        if (m_https) {
            static_cast<QSslSocket *>(serverSocket)->setProtocol(QSsl::SecureProtocols);
            static_cast<QSslSocket *>(serverSocket)->setPrivateKey(m_key);
-#ifdef QBT_USES_QT5
            static_cast<QSslSocket *>(serverSocket)->setLocalCertificateChain(m_certificates);
-#else
-            static_cast<QSslSocket *>(serverSocket)->setLocalCertificate(m_certificates.first());
-#endif
            static_cast<QSslSocket *>(serverSocket)->setPeerVerifyMode(QSslSocket::VerifyNone);
            static_cast<QSslSocket *>(serverSocket)->startServerEncryption();
        }
--- a/src/base/http/server.h
+++ b/src/base/http/server.h
@ -62,15 +62,10 @@ namespace Http
    private:
        IRequestHandler *m_requestHandler;

-#ifdef QBT_USES_QT5
        void incomingConnection(qintptr socketDescriptor);
-#else
-        void incomingConnection(int socketDescriptor);
-#endif

 #ifndef QT_NO_OPENSSL
        QList<QSslCipher> safeCipherList() const;
-
        bool m_https;
        QList<QSslCertificate> m_certificates;
        QSslKey m_key;
--- a/src/base/net/dnsupdater.cpp
+++ b/src/base/net/dnsupdater.cpp
@ -31,9 +31,7 @@
 #include <QDebug>
 #include <QRegExp>
 #include <QStringList>
-#ifdef QBT_USES_QT5
 #include <QUrlQuery>
-#endif

 #include "base/logger.h"
 #include "base/net/downloadmanager.h"
@ -158,15 +156,10 @@ QString DNSUpdater::getUpdateUrl() const
    }
    url.setPath("/nic/update");

-#ifndef QBT_USES_QT5
-    url.addQueryItem("hostname", m_domain);
-    url.addQueryItem("myip", m_lastIP.toString());
-#else
    QUrlQuery urlQuery(url);
    urlQuery.addQueryItem("hostname", m_domain);
    urlQuery.addQueryItem("myip", m_lastIP.toString());
    url.setQuery(urlQuery);
-#endif
    Q_ASSERT(url.isValid());

    qDebug() << Q_FUNC_INFO << url.toString();
--- a/src/base/net/downloadmanager.cpp
+++ b/src/base/net/downloadmanager.cpp
@ -79,26 +79,6 @@ namespace
        using QNetworkCookieJar::allCookies;
        using QNetworkCookieJar::setAllCookies;

-#ifndef QBT_USES_QT5
-        virtual bool deleteCookie(const QNetworkCookie &cookie)
-        {
-            auto myCookies = allCookies();
-
-            QList<QNetworkCookie>::Iterator it;
-            for (it = myCookies.begin(); it != myCookies.end(); ++it) {
-                if ((it->name() == cookie.name())
-                        && (it->domain() == cookie.domain())
-                        && (it->path() == cookie.path())) {
-                    myCookies.erase(it);
-                    setAllCookies(myCookies);
-                    return true;
-                }
-            }
-
-            return false;
-        }
-#endif
-
        QList<QNetworkCookie> cookiesForUrl(const QUrl &url) const override
        {
            QDateTime now = QDateTime::currentDateTime();
--- a/src/base/net/private/geoipdatabase.cpp
+++ b/src/base/net/private/geoipdatabase.cpp
@ -65,10 +65,6 @@ namespace
        Boolean = 14,
        Float = 15
    };
-
-#ifndef QBT_USES_QT5
-    Q_IPV6ADDR createMappedAddress(quint32 ip4);
-#endif
 }

 struct DataFieldDescriptor
@ -166,13 +162,7 @@ QDateTime GeoIPDatabase::buildEpoch() const

 QString GeoIPDatabase::lookup(const QHostAddress &hostAddr) const
 {
-#ifndef QBT_USES_QT5
-    Q_IPV6ADDR addr = hostAddr.protocol() == QAbstractSocket::IPv4Protocol
-            ? createMappedAddress(hostAddr.toIPv4Address())
-            : hostAddr.toIPv6Address();
-#else
    Q_IPV6ADDR addr = hostAddr.toIPv6Address();
-#endif

    const uchar *ptr = m_data;

@ -496,25 +486,3 @@ QVariant GeoIPDatabase::readArrayValue(quint32 &offset, quint32 count) const

    return array;
 }
-
-namespace
-{
-#ifndef QBT_USES_QT5
-    Q_IPV6ADDR createMappedAddress(quint32 ip4)
-    {
-        Q_IPV6ADDR ip6;
-        memset(&ip6, 0, sizeof(ip6));
-
-        int i;
-        for (i = 15; ip4 != 0; i--) {
-            ip6[i] = ip4 & 0xFF;
-            ip4 >>= 8;
-        }
-
-        ip6[11] = 0xFF;
-        ip6[10] = 0xFF;
-
-        return ip6;
-    }
-#endif
-}
--- a/src/base/net/smtp.h
+++ b/src/base/net/smtp.h
@ -126,8 +126,4 @@ namespace Net
    };
 }

-#ifndef QBT_USES_QT5
-Q_DECLARE_METATYPE(QAbstractSocket::SocketError)
-#endif
-
 #endif
--- a/src/base/preferences.cpp
+++ b/src/base/preferences.cpp
@ -1109,20 +1109,12 @@ void Preferences::setMainGeometry(const QByteArray &geometry)

 QByteArray Preferences::getMainVSplitterState() const
 {
-#ifdef QBT_USES_QT5
    return value("MainWindow/qt5/vsplitterState").toByteArray();
-#else
-    return value("MainWindow/vsplitterState").toByteArray();
-#endif
 }

 void Preferences::setMainVSplitterState(const QByteArray &state)
 {
-#ifdef QBT_USES_QT5
    setValue("MainWindow/qt5/vsplitterState", state);
-#else
-    setValue("MainWindow/vsplitterState", state);
-#endif
 }

 QString Preferences::getMainLastDir() const
@ -1169,20 +1161,12 @@ void Preferences::setPrefHSplitterSizes(const QStringList &sizes)

 QByteArray Preferences::getPeerListState() const
 {
-#ifdef QBT_USES_QT5
    return value("TorrentProperties/Peers/qt5/PeerListState").toByteArray();
-#else
-    return value("TorrentProperties/Peers/PeerListState").toByteArray();
-#endif
 }

 void Preferences::setPeerListState(const QByteArray &state)
 {
-#ifdef QBT_USES_QT5
    setValue("TorrentProperties/Peers/qt5/PeerListState", state);
-#else
-    setValue("TorrentProperties/Peers/PeerListState", state);
-#endif
 }

 QString Preferences::getPropSplitterSizes() const
@ -1197,20 +1181,12 @@ void Preferences::setPropSplitterSizes(const QString &sizes)

 QByteArray Preferences::getPropFileListState() const
 {
-#ifdef QBT_USES_QT5
    return value("TorrentProperties/qt5/FilesListState").toByteArray();
-#else
-    return value("TorrentProperties/FilesListState").toByteArray();
-#endif
 }

 void Preferences::setPropFileListState(const QByteArray &state)
 {
-#ifdef QBT_USES_QT5
    setValue("TorrentProperties/qt5/FilesListState", state);
-#else
-    setValue("TorrentProperties/FilesListState", state);
-#endif
 }

 int Preferences::getPropCurTab() const
@ -1235,20 +1211,12 @@ void Preferences::setPropVisible(const bool visible)

 QByteArray Preferences::getPropTrackerListState() const
 {
-#ifdef QBT_USES_QT5
    return value("TorrentProperties/Trackers/qt5/TrackerListState").toByteArray();
-#else
-    return value("TorrentProperties/Trackers/TrackerListState").toByteArray();
-#endif
 }

 void Preferences::setPropTrackerListState(const QByteArray &state)
 {
-#ifdef QBT_USES_QT5
    setValue("TorrentProperties/Trackers/qt5/TrackerListState", state);
-#else
-    setValue("TorrentProperties/Trackers/TrackerListState", state);
-#endif
 }

 QByteArray Preferences::getRssGeometry() const
@ -1263,20 +1231,12 @@ void Preferences::setRssGeometry(const QByteArray &geometry)

 QByteArray Preferences::getRssHSplitterSizes() const
 {
-#ifdef QBT_USES_QT5
    return value("RssFeedDownloader/qt5/hsplitterSizes").toByteArray();
-#else
-    return value("RssFeedDownloader/hsplitterSizes").toByteArray();
-#endif
 }

 void Preferences::setRssHSplitterSizes(const QByteArray &sizes)
 {
-#ifdef QBT_USES_QT5
    setValue("RssFeedDownloader/qt5/hsplitterSizes", sizes);
-#else
-    setValue("RssFeedDownloader/hsplitterSizes", sizes);
-#endif
 }

 QStringList Preferences::getRssOpenFolders() const
@ -1291,38 +1251,22 @@ void Preferences::setRssOpenFolders(const QStringList &folders)

 QByteArray Preferences::getRssSideSplitterState() const
 {
-#ifdef QBT_USES_QT5
    return value("Rss/qt5/splitter_h").toByteArray();
-#else
-    return value("Rss/splitter_h").toByteArray();
-#endif
 }

 void Preferences::setRssSideSplitterState(const QByteArray &state)
 {
-#ifdef QBT_USES_QT5
    setValue("Rss/qt5/splitter_h", state);
-#else
-    setValue("Rss/splitter_h", state);
-#endif
 }

 QByteArray Preferences::getRssMainSplitterState() const
 {
-#ifdef QBT_USES_QT5
    return value("Rss/qt5/splitterMain").toByteArray();
-#else
-    return value("Rss/splitterMain").toByteArray();
-#endif
 }

 void Preferences::setRssMainSplitterState(const QByteArray &state)
 {
-#ifdef QBT_USES_QT5
    setValue("Rss/qt5/splitterMain", state);
-#else
-    setValue("Rss/splitterMain", state);
-#endif
 }

 QByteArray Preferences::getSearchTabHeaderState() const
@ -1465,20 +1409,12 @@ void Preferences::setTransSelFilter(const int &index)

 QByteArray Preferences::getTransHeaderState() const
 {
-#ifdef QBT_USES_QT5
    return value("TransferList/qt5/HeaderState").toByteArray();
-#else
-    return value("TransferList/HeaderState").toByteArray();
-#endif
 }

 void Preferences::setTransHeaderState(const QByteArray &state)
 {
-#ifdef QBT_USES_QT5
    setValue("TransferList/qt5/HeaderState", state);
-#else
-    setValue("TransferList/HeaderState", state);
-#endif
 }

 //From old RssSettings class
--- a/src/base/settingsstorage.cpp
+++ b/src/base/settingsstorage.cpp
@ -75,20 +75,7 @@ namespace
        QString m_name;
    };

-#ifdef QBT_USES_QT5
    typedef QHash<QString, QString> MappingTable;
-#else
-    class MappingTable: public QHash<QString, QString>
-    {
-    public:
-        MappingTable(std::initializer_list<std::pair<QString, QString>> list)
-        {
-            reserve(static_cast<int>(list.size()));
-            for (const auto &i : list)
-                insert(i.first, i.second);
-        }
-    };
-#endif

    QString mapKey(const QString &key)
    {
@ -161,11 +148,7 @@ namespace
            {"Network/Proxy/IP", "Preferences/Connection/Proxy/IP"},
            {"Network/Proxy/Port", "Preferences/Connection/Proxy/Port"},
            {"Network/PortForwardingEnabled", "Preferences/Connection/UPnP"},
-#ifdef QBT_USES_QT5
            {"AddNewTorrentDialog/TreeHeaderState", "AddNewTorrentDialog/qt5/treeHeaderState"},
-#else
-            {"AddNewTorrentDialog/TreeHeaderState", "AddNewTorrentDialog/treeHeaderState"},
-#endif
            {"AddNewTorrentDialog/Width", "AddNewTorrentDialog/width"},
            {"AddNewTorrentDialog/Position", "AddNewTorrentDialog/y"},
            {"AddNewTorrentDialog/Expanded", "AddNewTorrentDialog/expanded"},
--- a/src/base/utils/fs.cpp
+++ b/src/base/utils/fs.cpp
@ -55,15 +55,7 @@
 #include <winbase.h>
 #endif

-#ifndef QBT_USES_QT5
-
-#ifndef DISABLE_GUI
-#include <QDesktopServices>
-#endif
-
-#else
 #include <QStandardPaths>
-#endif


 #include "misc.h"
@ -182,24 +174,7 @@ bool Utils::Fs::forceRemove(const QString& file_path)
 */
 void Utils::Fs::removeDirRecursive(const QString& dirName)
 {
-#ifdef QBT_USES_QT5
    QDir(dirName).removeRecursively();
-#else
-    QDir dir(dirName);
-
-    if (!dir.exists()) return;
-
-    Q_FOREACH(QFileInfo info, dir.entryInfoList(QDir::NoDotAndDotDot |
-                                                QDir::System |
-                                                QDir::Hidden |
-                                                QDir::AllDirs |
-                                                QDir::Files, QDir::DirsFirst)) {
-        if (info.isDir()) removeDirRecursive(info.absoluteFilePath());
-        else forceRemove(info.absoluteFilePath());
-    }
-
-    dir.rmdir(dirName);
-#endif
 }

 /**
@ -413,74 +388,12 @@ QString Utils::Fs::QDesktopServicesCacheLocation()

 QString Utils::Fs::QDesktopServicesDownloadLocation()
 {
-#ifdef QBT_USES_QT5
 #if defined(Q_OS_WIN)
    if (QSysInfo::windowsVersion() <= QSysInfo::WV_XP)  // Windows XP
        return QDir(QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation)).absoluteFilePath(
                    QCoreApplication::translate("fsutils", "Downloads"));
 #endif
    return QStandardPaths::writableLocation(QStandardPaths::DownloadLocation);
-#else
-
-#if defined(Q_OS_OS2)
-    return QDir(QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation)).absoluteFilePath(
-                QCoreApplication::translate("fsutils", "Downloads"));
-#endif
-
-#if defined(Q_OS_WIN)
-    // as long as it stays WinXP like we do the same on OS/2
-    // TODO: Use IKnownFolderManager to get path of FOLDERID_Downloads
-    // instead of hardcoding "Downloads"
-    // Unfortunately, this would break compatibility with WinXP
-    if (QSysInfo::windowsVersion() <= QSysInfo::WV_XP)  // Windows XP
-        return QDir(QDesktopServices::storageLocation(QDesktopServices::DocumentsLocation)).absoluteFilePath(
-                    QCoreApplication::translate("fsutils", "Downloads"));
-    else
-        return QDir(QDesktopServices::storageLocation(QDesktopServices::HomeLocation)).absoluteFilePath("Downloads");
-#endif
-
-#if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
-    QString save_path;
-    // Default save path on Linux
-    QString config_path = QString::fromLocal8Bit(qgetenv("XDG_CONFIG_HOME").constData());
-    if (config_path.isEmpty())
-        config_path = QDir::home().absoluteFilePath(".config");
-
-    QString user_dirs_file = config_path + "/user-dirs.dirs";
-    if (QFile::exists(user_dirs_file)) {
-        QSettings settings(user_dirs_file, QSettings::IniFormat);
-        // We need to force UTF-8 encoding here since this is not
-        // the default for Ini files.
-        settings.setIniCodec("UTF-8");
-        QString xdg_download_dir = settings.value("XDG_DOWNLOAD_DIR").toString();
-        if (!xdg_download_dir.isEmpty()) {
-            // Resolve $HOME environment variables
-            xdg_download_dir.replace("$HOME", QDir::homePath());
-            save_path = xdg_download_dir;
-            qDebug() << Q_FUNC_INFO << "SUCCESS: Using XDG path for downloads: " << save_path;
-        }
-    }
-
-    // Fallback
-    if (!save_path.isEmpty() && !QFile::exists(save_path)) {
-        QDir().mkpath(save_path);
-    }
-
-    if (save_path.isEmpty() || !QFile::exists(save_path)) {
-        save_path = QDir::home().absoluteFilePath(QCoreApplication::translate("fsutils", "Downloads"));
-        qDebug() << Q_FUNC_INFO << "using" << save_path << "as fallback since the XDG detection did not work";
-    }
-
-    return save_path;
-#endif
-
-#if defined(Q_OS_MAC)
-    // TODO: How to support this on Mac OS?
-#endif
-
-    // Fallback
-    return QDir::home().absoluteFilePath(QCoreApplication::translate("fsutils", "Downloads"));
-#endif
 }

 QString Utils::Fs::cacheLocation()
--- a/src/base/utils/string.cpp
+++ b/src/base/utils/string.cpp
@ -32,12 +32,9 @@
 #include <cmath>

 #include <QByteArray>
+#include <QCollator>
 #include <QtGlobal>
 #include <QLocale>
-
-#ifdef QBT_USES_QT5
-#include <QCollator>
-#endif
 #ifdef Q_OS_MAC
 #include <QThreadStorage>
 #endif
@ -50,7 +47,6 @@ namespace
        explicit NaturalCompare(const bool caseSensitive = true)
            : m_caseSensitive(caseSensitive)
        {
-#ifdef QBT_USES_QT5
 #if defined(Q_OS_WIN)
            // Without ICU library, QCollator uses the native API on Windows 7+. But that API
            // sorts older versions of μTorrent differently than the newer ones because the
@ -63,12 +59,10 @@ namespace
 #endif
            m_collator.setNumericMode(true);
            m_collator.setCaseSensitivity(caseSensitive ? Qt::CaseSensitive : Qt::CaseInsensitive);
-#endif
        }

        bool operator()(const QString &left, const QString &right) const
        {
-#ifdef QBT_USES_QT5
 #if defined(Q_OS_WIN)
            // Without ICU library, QCollator uses the native API on Windows 7+. But that API
            // sorts older versions of μTorrent differently than the newer ones because the
@ -80,9 +74,6 @@ namespace
                return lessThan(left, right);
 #endif
            return (m_collator.compare(left, right) < 0);
-#else
-            return lessThan(left, right);
-#endif
        }

        bool lessThan(const QString &left, const QString &right) const
@ -111,20 +102,12 @@ namespace
                int startL = posL;
                while ((posL < left.size()) && left[posL].isDigit())
                    ++posL;
-#ifdef QBT_USES_QT5
                int numL = left.midRef(startL, posL - startL).toInt();
-#else
-                int numL = left.mid(startL, posL - startL).toInt();
-#endif

                int startR = posR;
                while ((posR < right.size()) && right[posR].isDigit())
                    ++posR;
-#ifdef QBT_USES_QT5
                int numR = right.midRef(startR, posR - startR).toInt();
-#else
-                int numR = right.mid(startR, posR - startR).toInt();
-#endif

                if (numL != numR)
                    return (numL < numR);
@ -136,9 +119,7 @@ namespace
        }

    private:
-#ifdef QBT_USES_QT5
        QCollator m_collator;
-#endif
        const bool m_caseSensitive;
    };
 }
--- a/src/config.h.cmakein
+++ b/src/config.h.cmakein
@ -1,4 +1,3 @@
-#cmakedefine QBT_USES_QT5
 #cmakedefine QBT_USE_GUI

 #ifndef QBT_USE_GUI
--- a/src/gui/ico.cpp
+++ b/src/gui/ico.cpp
@ -424,9 +424,7 @@ bool ICOHandler::canRead(QIODevice *device)

 class ICOPlugin : public QImageIOPlugin
 {
-#ifdef QBT_USES_QT5
    Q_PLUGIN_METADATA(IID "org.qbittorrent.ICOPlugin")
-#endif
 public:
    QStringList keys() const;
    Capabilities capabilities(QIODevice *device, const QByteArray &format) const;
@ -460,8 +458,3 @@ QImageIOHandler *ICOPlugin::create(QIODevice *device, const QByteArray &format)
    handler->setFormat(format);
    return handler;
 }
-
-#ifndef QBT_USES_QT5
-Q_EXPORT_STATIC_PLUGIN(ICOPlugin)
-Q_EXPORT_PLUGIN2(ico, ICOPlugin)
-#endif
--- a/src/gui/lineedit/CMakeLists.txt
+++ b/src/gui/lineedit/CMakeLists.txt
@ -11,10 +11,6 @@ resources/lineeditimages.qrc
 )

 add_library(qbt_lineedit STATIC ${QBT_LINEEDIT_SOURCES} ${QBT_LINEEDIT_HEADERS})
-if (QT4_FOUND)
-    target_link_libraries(qbt_lineedit Qt4::QtGui)
-else (QT4_FOUND)
-    target_link_libraries(qbt_lineedit Qt5::Widgets)
-endif (QT4_FOUND)
+target_link_libraries(qbt_lineedit Qt5::Widgets)

 qbt_target_sources(${QBT_LINEEDIT_RESOURCES})
--- a/src/gui/lineedit/src/lineedit.cpp
+++ b/src/gui/lineedit/src/lineedit.cpp
@ -25,24 +25,8 @@ LineEdit::LineEdit(QWidget *parent)
    QSize searchButtonHint = searchButton->sizeHint();

    QSize clearButtonHint(0, 0);
-#ifndef QBT_USES_QT5
-    QPixmap pixmap2(":/lineeditimages/clear_left.png");
-    clearButton = new QToolButton(this);
-    clearButton->setIcon(QIcon(pixmap2));
-    clearButton->setIconSize(pixmap2.size());
-    clearButton->setCursor(Qt::ArrowCursor);
-    clearButton->setStyleSheet("QToolButton { border: none; padding: 2px; }");
-    clearButton->setToolTip(tr("Clear the text"));
-    clearButton->hide();
-    connect(clearButton, SIGNAL(clicked()), this, SLOT(clear()));
-    connect(this, SIGNAL(textChanged(const QString &)), this, SLOT(updateCloseButton(const QString &)));
-
-    clearButtonHint = clearButton->sizeHint();
-    setStyleSheet(QString("QLineEdit { padding-left: %1px; padding-right: %2px; }").arg(searchButtonHint.width()).arg(clearButtonHint.width()));
-#else
    setClearButtonEnabled(true);
    setStyleSheet(QString("QLineEdit { padding-left: %1px; }").arg(searchButtonHint.width()));  // padding between text and widget borders
-#endif

    QSize widgetHint = sizeHint();
    int frameWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth);
@ -56,15 +40,5 @@ void LineEdit::resizeEvent(QResizeEvent *e)

    QSize sz = searchButton->sizeHint();
    searchButton->move(frameWidth, (e->size().height() - sz.height()) / 2);
-#ifndef QBT_USES_QT5
-    QSize cz = clearButton->sizeHint();
-    clearButton->move((e->size().width() - frameWidth - cz.width()), (e->size().height() - sz.height()) / 2);
-#endif
 }

-#ifndef QBT_USES_QT5
-void LineEdit::updateCloseButton(const QString &text)
-{
-    clearButton->setVisible(!text.isEmpty());
-}
-#endif
--- a/src/gui/lineedit/src/lineedit.h
+++ b/src/gui/lineedit/src/lineedit.h
@ -24,16 +24,8 @@ public:
 protected:
    void resizeEvent(QResizeEvent *e);

-#ifndef QBT_USES_QT5
-private slots:
-    void updateCloseButton(const QString &text);
-#endif
-
 private:
    QToolButton *searchButton;
-#ifndef QBT_USES_QT5
-    QToolButton *clearButton;
-#endif
 };

 #endif // LIENEDIT_H
--- a/src/gui/optionsdlg.cpp
+++ b/src/gui/optionsdlg.cpp
@ -122,11 +122,7 @@ OptionsDialog::OptionsDialog(QWidget *parent)
        }
    }

-#ifndef QBT_USES_QT5
-    m_ui->scanFoldersView->header()->setResizeMode(QHeaderView::ResizeToContents);
-#else
    m_ui->scanFoldersView->header()->setSectionResizeMode(QHeaderView::ResizeToContents);
-#endif
    m_ui->scanFoldersView->setModel(ScanFoldersModel::instance());
    m_ui->scanFoldersView->setItemDelegate(new ScanFoldersDelegate(this, m_ui->scanFoldersView));
    connect(ScanFoldersModel::instance(), SIGNAL(dataChanged(QModelIndex, QModelIndex)), this, SLOT(enableApplyButton()));
--- a/src/gui/previewlistdelegate.h
+++ b/src/gui/previewlistdelegate.h
@ -42,12 +42,8 @@
 #include "previewselect.h"

 #ifdef Q_OS_WIN
-#ifndef QBT_USES_QT5
-#include <QPlastiqueStyle>
-#else
 #include <QProxyStyle>
 #endif
-#endif

 class PreviewListDelegate: public QItemDelegate {
  Q_OBJECT
@ -80,11 +76,7 @@ class PreviewListDelegate: public QItemDelegate {
          QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
 #else
          // XXX: To avoid having the progress text on the right of the bar
-#ifndef QBT_USES_QT5
-          QPlastiqueStyle st;
-#else
          QProxyStyle st("fusion");
-#endif
          st.drawControl(QStyle::CE_ProgressBar, &newopt, painter, 0);
 #endif
          break;
--- a/src/gui/previewselect.cpp
+++ b/src/gui/previewselect.cpp
@ -32,9 +32,7 @@
 #include <QHeaderView>
 #include <QMessageBox>
 #include <QFile>
-#ifdef QBT_USES_QT5
 #include <QTableView>
-#endif

 #include "base/utils/misc.h"
 #include "previewlistdelegate.h"
@ -54,14 +52,12 @@ PreviewSelect::PreviewSelect(QWidget* parent, BitTorrent::TorrentHandle *const t
  previewListModel->setHeaderData(NAME, Qt::Horizontal, tr("Name"));
  previewListModel->setHeaderData(SIZE, Qt::Horizontal, tr("Size"));
  previewListModel->setHeaderData(PROGRESS, Qt::Horizontal, tr("Progress"));
-#ifdef QBT_USES_QT5
    // This hack fixes reordering of first column with Qt5.
    // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
    QTableView unused;
    unused.setVerticalHeader(previewList->header());
    previewList->header()->setParent(previewList);
    unused.setVerticalHeader(new QHeaderView(Qt::Horizontal));
-#endif
  previewList->setModel(previewListModel);
  previewList->hideColumn(FILE_INDEX);
  listDelegate = new PreviewListDelegate(this);
--- a/src/gui/properties/CMakeLists.txt
+++ b/src/gui/properties/CMakeLists.txt
@ -44,6 +44,4 @@ speedplotview.cpp

 add_library(qbt_properties STATIC ${QBT_PROPERTIES_HEADERS} ${QBT_PROPERTIES_SOURCES})
 target_link_libraries(qbt_properties qbt_base)
-if (NOT QT4_FOUND)
-    target_link_libraries(qbt_properties Qt5::Widgets Qt5::Concurrent)
-endif (NOT QT4_FOUND)
+target_link_libraries(qbt_properties Qt5::Widgets Qt5::Concurrent)
--- a/src/gui/properties/peerlistwidget.cpp
+++ b/src/gui/properties/peerlistwidget.cpp
@ -36,9 +36,7 @@
 #include <QClipboard>
 #include <QMessageBox>
 #include <QWheelEvent>
-#ifdef QBT_USES_QT5
 #include <QTableView>
-#endif

 #include "base/net/reverseresolution.h"
 #include "base/bittorrent/torrenthandle.h"
@ -135,14 +133,12 @@ PeerListWidget::PeerListWidget(PropertiesWidget *parent)
    handleSortColumnChanged(header()->sortIndicatorSection());
    m_copyHotkey = new QShortcut(QKeySequence::Copy, this, SLOT(copySelectedPeers()), 0, Qt::WidgetShortcut);

-#ifdef QBT_USES_QT5
    // This hack fixes reordering of first column with Qt5.
    // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
    QTableView unused;
    unused.setVerticalHeader(this->header());
    this->header()->setParent(this);
    unused.setVerticalHeader(new QHeaderView(Qt::Horizontal));
-#endif
 }

 PeerListWidget::~PeerListWidget()
--- a/src/gui/properties/peersadditiondlg.cpp
+++ b/src/gui/properties/peersadditiondlg.cpp
@ -39,10 +39,8 @@ PeersAdditionDlg::PeersAdditionDlg(QWidget *parent)
    setupUi(this);
    connect(buttonBox, SIGNAL(accepted()), this, SLOT(validateInput()));

-#ifdef QBT_USES_QT5
    label_format->hide();
    peers_txt->setPlaceholderText("Format: IPv4:port / [IPv6]:port");
-#endif
 }

 QList<BitTorrent::PeerAddress> PeersAdditionDlg::askForPeers()
--- a/src/gui/properties/propertieswidget.cpp
+++ b/src/gui/properties/propertieswidget.cpp
@ -102,15 +102,8 @@ PropertiesWidget::PropertiesWidget(QWidget *parent, MainWindow *main_window, Tra
    connect(filesList->header(), SIGNAL(sectionResized(int,int,int)), this, SLOT(saveSettings()));
    connect(filesList->header(), SIGNAL(sortIndicatorChanged(int,Qt::SortOrder)), this, SLOT(saveSettings()));

-#ifdef QBT_USES_QT5
    // set bar height relative to screen dpi
    int barHeight = devicePixelRatio() * 18;
-#else
-    // set bar height relative to font height
-    QFont defFont;
-    QFontMetrics fMetrics(defFont, 0); // need to be device-dependent
-    int barHeight = fMetrics.height() * 5 / 4;
-#endif

    // Downloaded pieces progress bar
    tempProgressBarArea->setVisible(false);
--- a/src/gui/properties/proplistdelegate.cpp
+++ b/src/gui/properties/proplistdelegate.cpp
@ -36,12 +36,8 @@
 #include <QStyleOptionProgressBar>

 #ifdef Q_OS_WIN
-#ifndef QBT_USES_QT5
-#include <QPlastiqueStyle>
-#else
 #include <QProxyStyle>
 #endif
-#endif

 #include "base/utils/misc.h"
 #include "base/utils/string.h"
@ -106,11 +102,7 @@ void PropListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &opti
            QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
 #else
            // XXX: To avoid having the progress text on the right of the bar
-#ifndef QBT_USES_QT5
-            QPlastiqueStyle st;
-#else
            QProxyStyle st("fusion");
-#endif
            st.drawControl(QStyle::CE_ProgressBar, &newopt, painter, 0);
 #endif
        }
--- a/src/gui/properties/trackerlist.cpp
+++ b/src/gui/properties/trackerlist.cpp
@ -37,10 +37,8 @@
 #include <QDebug>
 #include <QUrl>
 #include <QMessageBox>
-#ifdef QBT_USES_QT5
 #include <QTableView>
 #include <QHeaderView>
-#endif

 #include "base/bittorrent/session.h"
 #include "base/bittorrent/torrenthandle.h"
@ -88,14 +86,12 @@ TrackerList::TrackerList(PropertiesWidget *properties): QTreeWidget(), propertie
  deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(deleteSelectedTrackers()), 0, Qt::WidgetShortcut);
  copyHotkey = new QShortcut(QKeySequence::Copy, this, SLOT(copyTrackerUrl()), 0, Qt::WidgetShortcut);

-#ifdef QBT_USES_QT5
    // This hack fixes reordering of first column with Qt5.
    // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
    QTableView unused;
    unused.setVerticalHeader(this->header());
    this->header()->setParent(this);
    unused.setVerticalHeader(new QHeaderView(Qt::Horizontal));
-#endif

  loadSettings();
 }
--- a/src/gui/rss/CMakeLists.txt
+++ b/src/gui/rss/CMakeLists.txt
@ -24,8 +24,4 @@ rsssettingsdlg.ui

 add_library(qbt_rss STATIC ${QBT_RSS_HEADERS} ${QBT_RSS_SOURCE} ${QBT_RSS_FORMS})
 target_link_libraries(qbt_rss qbt_base)
-if (QT4_FOUND)
-    target_link_libraries(qbt_rss Qt4::QtGui Qt4::QtNetwork)
-else (QT4_FOUND)
-    target_link_libraries(qbt_rss Qt5::Gui Qt5::Widgets Qt5::Network)
-endif (QT4_FOUND)
+target_link_libraries(qbt_rss Qt5::Gui Qt5::Widgets Qt5::Network)
--- a/src/gui/search/pluginselectdlg.cpp
+++ b/src/gui/search/pluginselectdlg.cpp
@ -36,9 +36,7 @@
 #include <QDropEvent>
 #include <QMimeData>
 #include <QClipboard>
-#ifdef QBT_USES_QT5
 #include <QTableView>
-#endif

 #include "base/utils/fs.h"
 #include "base/utils/misc.h"
@ -69,14 +67,13 @@ PluginSelectDlg::PluginSelectDlg(SearchEngine *pluginManager, QWidget *parent)
    setupUi(this);
    setAttribute(Qt::WA_DeleteOnClose);

-#ifdef QBT_USES_QT5
    // This hack fixes reordering of first column with Qt5.
    // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
    QTableView unused;
    unused.setVerticalHeader(pluginsTree->header());
    pluginsTree->header()->setParent(pluginsTree);
    unused.setVerticalHeader(new QHeaderView(Qt::Horizontal));
-#endif
+
    pluginsTree->setRootIsDecorated(false);
    pluginsTree->header()->resizeSection(0, 160);
    pluginsTree->header()->resizeSection(1, 80);
--- a/src/gui/search/searchtab.cpp
+++ b/src/gui/search/searchtab.cpp
@ -39,9 +39,7 @@
 #include <QLabel>
 #include <QPalette>
 #include <QVBoxLayout>
-#ifdef QBT_USES_QT5
 #include <QTableView>
-#endif

 #include "base/utils/misc.h"
 #include "base/preferences.h"
@ -67,14 +65,13 @@ SearchTab::SearchTab(SearchWidget *parent)
 {
    m_ui->setupUi(this);

-#ifdef QBT_USES_QT5
    // This hack fixes reordering of first column with Qt5.
    // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
    QTableView unused;
    unused.setVerticalHeader(m_ui->resultsBrowser->header());
    m_ui->resultsBrowser->header()->setParent(m_ui->resultsBrowser);
    unused.setVerticalHeader(new QHeaderView(Qt::Horizontal));
-#endif
+
    loadSettings();
    m_ui->resultsBrowser->setSelectionMode(QAbstractItemView::ExtendedSelection);
    header()->setStretchLastSection(false);
--- a/src/gui/torrentcontenttreeview.cpp
+++ b/src/gui/torrentcontenttreeview.cpp
@ -32,24 +32,20 @@

 #include <QKeyEvent>
 #include <QModelIndexList>
-#ifdef QBT_USES_QT5
 #include <QTableView>
 #include <QHeaderView>
-#endif

 #include "torrentcontentmodelitem.h"

 TorrentContentTreeView::TorrentContentTreeView(QWidget* parent)
  : QTreeView(parent)
 {
-#ifdef QBT_USES_QT5
    // This hack fixes reordering of first column with Qt5.
    // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
    QTableView unused;
    unused.setVerticalHeader(header());
    header()->setParent(this);
    unused.setVerticalHeader(new QHeaderView(Qt::Horizontal));
-#endif
 }

 void TorrentContentTreeView::keyPressEvent(QKeyEvent *event) {
--- a/src/gui/transferlistdelegate.cpp
+++ b/src/gui/transferlistdelegate.cpp
@ -44,12 +44,8 @@
 #include "base/unicodestrings.h"

 #ifdef Q_OS_WIN
-#ifndef QBT_USES_QT5
-#include <QPlastiqueStyle>
-#else
 #include <QProxyStyle>
 #endif
-#endif

 TransferListDelegate::TransferListDelegate(QObject *parent)
    : QItemDelegate(parent)
@ -175,11 +171,7 @@ void TransferListDelegate::paint(QPainter * painter, const QStyleOptionViewItem
        QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
 #else
        // XXX: To avoid having the progress text on the right of the bar
-#ifndef QBT_USES_QT5
-        QPlastiqueStyle st;
-#else
        QProxyStyle st("fusion");
-#endif
        st.drawControl(QStyle::CE_ProgressBar, &newopt, painter, 0);
 #endif
        break;
--- a/src/gui/transferlistwidget.cpp
+++ b/src/gui/transferlistwidget.cpp
@ -41,9 +41,7 @@
 #include <QFileDialog>
 #include <QMessageBox>
 #include <QWheelEvent>
-#ifdef QBT_USES_QT5
 #include <QTableView>
-#endif

 #include "transferlistwidget.h"
 #include "base/bittorrent/session.h"
@ -161,14 +159,12 @@ TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *main_window)
    doubleClickHotkey = new QShortcut(Qt::Key_Return, this, SLOT(torrentDoubleClicked()), 0, Qt::WidgetShortcut);
    recheckHotkey = new QShortcut(Qt::CTRL + Qt::Key_R, this, SLOT(recheckSelectedTorrents()), 0, Qt::WidgetShortcut);

-#ifdef QBT_USES_QT5
    // This hack fixes reordering of first column with Qt5.
    // https://github.com/qtproject/qtbase/commit/e0fc088c0c8bc61dbcaf5928b24986cd61a22777
    QTableView unused;
    unused.setVerticalHeader(header());
    header()->setParent(this);
    unused.setVerticalHeader(new QHeaderView(Qt::Horizontal));
-#endif
 }

 TransferListWidget::~TransferListWidget()
--- a/src/src.pro
+++ b/src/src.pro
@ -5,7 +5,6 @@ CONFIG += qt thread silent
 # C++11 support
 CONFIG += c++11
 DEFINES += BOOST_NO_CXX11_RVALUE_REFERENCES
-greaterThan(QT_MAJOR_VERSION, 4): greaterThan(QT_MINOR_VERSION, 1): DEFINES += QBT_USES_QT5

 lessThan(QT_MAJOR_VERSION, 5): DEFINES += QStringLiteral=QLatin1String

--- a/src/webui/CMakeLists.txt
+++ b/src/webui/CMakeLists.txt
@ -17,20 +17,8 @@ webapplication.cpp
 webui.cpp
 )

-if (QT4_FOUND)
-    if (NOT SYSTEM_QJSON)
-        add_subdirectory(qjson)
-    else (NOT SYSTEM_QJSON)
-        find_package(QJSON REQUIRED)
-        add_definitions(-DUSE_SYSTEM_QJSON)
-    endif(NOT SYSTEM_QJSON)
-endif (QT4_FOUND)
-
 qbt_target_sources(webui.qrc)

 add_library(qbt_webui STATIC ${QBT_WEBUI_HEADERS} ${QBT_WEBUI_SOURCES})
 target_link_libraries(qbt_webui qbt_base)

-if (QT4_FOUND)
-    target_link_libraries(qbt_webui qjson)
-endif (QT4_FOUND)
--- a/src/webui/abstractwebapplication.cpp
+++ b/src/webui/abstractwebapplication.cpp
@ -271,20 +271,12 @@ void AbstractWebApplication::translateDocument(QString& data)
            if (isTranslationNeeded) {
                QString context = regex.cap(4);
                if (context.length() > 0) {
-#ifndef QBT_USES_QT5
-                    translation = qApp->translate(context.toUtf8().constData(), word.constData(), 0, QCoreApplication::UnicodeUTF8, 1);
-#else
                    translation = qApp->translate(context.toUtf8().constData(), word.constData(), 0, 1);
-#endif
                }
                else {
                    size_t context_index = 0;
                    while ((context_index < context_count) && (translation == word)) {
-#ifndef QBT_USES_QT5
-                        translation = qApp->translate(contexts[context_index].c_str(), word.constData(), 0, QCoreApplication::UnicodeUTF8, 1);
-#else
                        translation = qApp->translate(contexts[context_index].c_str(), word.constData(), 0, 1);
-#endif
                        ++context_index;
                    }
                }
--- a/src/webui/btjson.cpp
+++ b/src/webui/btjson.cpp
@ -33,10 +33,6 @@
 #include <QDebug>
 #include <QVariant>

-#ifndef QBT_USES_QT5
-#include <QMetaType>
-#endif
-
 #if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
 #include <QElapsedTimer>
 #endif
@ -54,8 +50,6 @@
 #include "base/utils/misc.h"
 #include "jsonutils.h"

-#if QT_VERSION >= QT_VERSION_CHECK(4, 7, 0)
-
 #define CACHED_VARIABLE(VARTYPE, VAR, DUR) \
    static VARTYPE VAR; \
    static QElapsedTimer cacheTimer; \
@ -76,15 +70,6 @@
    cacheTimer.start(); \
    VAR = VARTYPE()

-#else
-// We don't support caching for Qt < 4.7 at the moment
-#define CACHED_VARIABLE(VARTYPE, VAR, DUR) \
-    VARTYPE VAR
-
-#define CACHED_VARIABLE_FOR_HASH(VARTYPE, VAR, DUR, HASH) \
-    VARTYPE VAR
-
-#endif

 // Numerical constants
 static const int CACHE_DURATION_MS = 1500; // 1500ms
@ -238,50 +223,18 @@ public:
    QTorrentCompare(QString key, bool greaterThan = false)
        : key_(key)
        , greaterThan_(greaterThan)
-#ifndef QBT_USES_QT5
-        , type_(QVariant::Invalid)
-#endif
    {
    }

    bool operator()(QVariant torrent1, QVariant torrent2)
    {
-#ifndef QBT_USES_QT5
-        if (type_ == QVariant::Invalid)
-            type_ = torrent1.toMap().value(key_).type();
-
-        switch (static_cast<QMetaType::Type>(type_)) {
-        case QMetaType::Int:
-            return greaterThan_ ? torrent1.toMap().value(key_).toInt() > torrent2.toMap().value(key_).toInt()
-                   : torrent1.toMap().value(key_).toInt() < torrent2.toMap().value(key_).toInt();
-        case QMetaType::LongLong:
-            return greaterThan_ ? torrent1.toMap().value(key_).toLongLong() > torrent2.toMap().value(key_).toLongLong()
-                   : torrent1.toMap().value(key_).toLongLong() < torrent2.toMap().value(key_).toLongLong();
-        case QMetaType::ULongLong:
-            return greaterThan_ ? torrent1.toMap().value(key_).toULongLong() > torrent2.toMap().value(key_).toULongLong()
-                   : torrent1.toMap().value(key_).toULongLong() < torrent2.toMap().value(key_).toULongLong();
-        case QMetaType::Float:
-            return greaterThan_ ? torrent1.toMap().value(key_).toFloat() > torrent2.toMap().value(key_).toFloat()
-                   : torrent1.toMap().value(key_).toFloat() < torrent2.toMap().value(key_).toFloat();
-        case QMetaType::Double:
-            return greaterThan_ ? torrent1.toMap().value(key_).toDouble() > torrent2.toMap().value(key_).toDouble()
-                   : torrent1.toMap().value(key_).toDouble() < torrent2.toMap().value(key_).toDouble();
-        default:
-            return greaterThan_ ? torrent1.toMap().value(key_).toString() > torrent2.toMap().value(key_).toString()
-                   : torrent1.toMap().value(key_).toString() < torrent2.toMap().value(key_).toString();
-        }
-#else
        return greaterThan_ ? torrent1.toMap().value(key_) > torrent2.toMap().value(key_)
               : torrent1.toMap().value(key_) < torrent2.toMap().value(key_);
-#endif
    }

 private:
    QString key_;
    bool greaterThan_;
-#ifndef QBT_USES_QT5
-    QVariant::Type type_;
-#endif
 };

 /**
@ -947,7 +900,7 @@ QVariantMap generateSyncData(int acceptedResponseId, QVariantMap data, QVariantM
        lastAcceptedData.clear();
        syncData = data;

-#if (QBT_USES_QT5 && QT_VERSION < QT_VERSION_CHECK(5, 5, 0))
+#if QT_VERSION < QT_VERSION_CHECK(5, 5, 0)
        // QJsonDocument::fromVariant() supports QVariantHash only
        // since Qt5.5, so manually convert data["torrents"]
        QVariantMap torrentsMap;
--- a/src/webui/jsonutils.h
+++ b/src/webui/jsonutils.h
@ -30,41 +30,20 @@
 #define JSONUTILS_H

 #include <QVariant>
-#ifdef QBT_USES_QT5
 #include <QJsonDocument>
 #include <QJsonObject>
 #include <QJsonArray>
-#else
-#include <QString>
-#ifndef USE_SYSTEM_QJSON
-#include "qjson/parser.h"
-#include "qjson/serializer.h"
-#else // USE_SYSTEM_QJSON
-#include <qjson/parser.h>
-#include <qjson/serializer.h>
-#endif // USE_SYSTEM_QJSON
-#endif

 namespace json {

    inline QByteArray toJson(const QVariant& var)
    {
-#ifdef QBT_USES_QT5
        return QJsonDocument::fromVariant(var).toJson(QJsonDocument::Compact);
-#else
-        QJson::Serializer serializer;
-        serializer.setIndentMode(QJson::IndentCompact);
-        return serializer.serialize(var);
-#endif
    }

    inline QVariant fromJson(const QString& json)
    {
-#ifdef QBT_USES_QT5
        return QJsonDocument::fromJson(json.toUtf8()).toVariant();
-#else
-        return QJson::Parser().parse(json.toUtf8());
-#endif
    }

 }
--- a/src/webui/qjson/CMakeLists.txt
+++ b/src/webui/qjson/CMakeLists.txt
@ -1,25 +0,0 @@
-include_directories("${CMAKE_CURRENT_SOURCE_DIR}")
-set(QJSON_HEADERS
-FlexLexer.h
-stack.hh
-position.hh
-location.hh
-json_parser.hh
-json_scanner.h
-parser.h
-parser_p.h
-qjson_debug.h
-qjson_export.h
-serializer.h
-)
-
-set(QJSON_SOURCES
-json_parser.cc
-json_scanner.cc
-json_scanner.cpp
-parser.cpp
-serializer.cpp
-)
-
-add_library(qjson STATIC ${QJSON_HEADERS} ${QJSON_SOURCES})
-
--- a/src/webui/qjson/FlexLexer.h
+++ b/src/webui/qjson/FlexLexer.h
@ -1,206 +0,0 @@
-// -*-C++-*-
-// FlexLexer.h -- define interfaces for lexical analyzer classes generated
-// by flex
-
-// Copyright (c) 1993 The Regents of the University of California.
-// All rights reserved.
-//
-// This code is derived from software contributed to Berkeley by
-// Kent Williams and Tom Epperly.
-//
-//  Redistribution and use in source and binary forms, with or without
-//  modification, are permitted provided that the following conditions
-//  are met:
-
-//  1. Redistributions of source code must retain the above copyright
-//  notice, this list of conditions and the following disclaimer.
-//  2. Redistributions in binary form must reproduce the above copyright
-//  notice, this list of conditions and the following disclaimer in the
-//  documentation and/or other materials provided with the distribution.
-
-//  Neither the name of the University nor the names of its contributors
-//  may be used to endorse or promote products derived from this software
-//  without specific prior written permission.
-
-//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
-//  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
-//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-//  PURPOSE.
-
-// This file defines FlexLexer, an abstract class which specifies the
-// external interface provided to flex C++ lexer objects, and yyFlexLexer,
-// which defines a particular lexer class.
-//
-// If you want to create multiple lexer classes, you use the -P flag
-// to rename each yyFlexLexer to some other xxFlexLexer.  You then
-// include <FlexLexer.h> in your other sources once per lexer class:
-//
-//	#undef yyFlexLexer
-//	#define yyFlexLexer xxFlexLexer
-//	#include <FlexLexer.h>
-//
-//	#undef yyFlexLexer
-//	#define yyFlexLexer zzFlexLexer
-//	#include <FlexLexer.h>
-//	...
-
-#ifndef __FLEX_LEXER_H
-// Never included before - need to define base class.
-#define __FLEX_LEXER_H
-
-#include <iostream>
-#  ifndef FLEX_STD
-#    define FLEX_STD std::
-#  endif
-
-extern "C++" {
-
-struct yy_buffer_state;
-typedef int yy_state_type;
-
-class FlexLexer {
-public:
-	virtual ~FlexLexer()	{ }
-
-	const char* YYText() const	{ return yytext; }
-	int YYLeng()	const	{ return yyleng; }
-
-	virtual void
-		yy_switch_to_buffer( struct yy_buffer_state* new_buffer ) = 0;
-	virtual struct yy_buffer_state*
-		yy_create_buffer( FLEX_STD istream* s, int size ) = 0;
-	virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;
-	virtual void yyrestart( FLEX_STD istream* s ) = 0;
-
-	virtual int yylex() = 0;
-
-	// Call yylex with new input/output sources.
-	int yylex( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 )
-		{
-		switch_streams( new_in, new_out );
-		return yylex();
-		}
-
-	// Switch to new input/output streams.  A nil stream pointer
-	// indicates "keep the current one".
-	virtual void switch_streams( FLEX_STD istream* new_in = 0,
-					FLEX_STD ostream* new_out = 0 ) = 0;
-
-	int lineno() const		{ return yylineno; }
-
-	int debug() const		{ return yy_flex_debug; }
-	void set_debug( int flag )	{ yy_flex_debug = flag; }
-
-protected:
-	char* yytext;
-	int yyleng;
-	int yylineno;		// only maintained if you use %option yylineno
-	int yy_flex_debug;	// only has effect with -d or "%option debug"
-};
-
-}
-#endif // FLEXLEXER_H
-
-#if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
-// Either this is the first time through (yyFlexLexerOnce not defined),
-// or this is a repeated include to define a different flavor of
-// yyFlexLexer, as discussed in the flex manual.
-#define yyFlexLexerOnce
-
-extern "C++" {
-
-class yyFlexLexer : public FlexLexer {
-public:
-	// arg_yyin and arg_yyout default to the cin and cout, but we
-	// only make that assignment when initializing in yylex().
-	yyFlexLexer( FLEX_STD istream* arg_yyin = 0, FLEX_STD ostream* arg_yyout = 0 );
-
-	virtual ~yyFlexLexer();
-
-	void yy_switch_to_buffer( struct yy_buffer_state* new_buffer );
-	struct yy_buffer_state* yy_create_buffer( FLEX_STD istream* s, int size );
-	void yy_delete_buffer( struct yy_buffer_state* b );
-	void yyrestart( FLEX_STD istream* s );
-
-	void yypush_buffer_state( struct yy_buffer_state* new_buffer );
-	void yypop_buffer_state();
-
-	virtual int yylex();
-	virtual void switch_streams( FLEX_STD istream* new_in, FLEX_STD ostream* new_out = 0 );
-	virtual int yywrap();
-
-protected:
-	virtual int LexerInput( char* buf, int max_size );
-	virtual void LexerOutput( const char* buf, int size );
-	virtual void LexerError( const char* msg );
-
-	void yyunput( int c, char* buf_ptr );
-	int yyinput();
-
-	void yy_load_buffer_state();
-	void yy_init_buffer( struct yy_buffer_state* b, FLEX_STD istream* s );
-	void yy_flush_buffer( struct yy_buffer_state* b );
-
-	int yy_start_stack_ptr;
-	int yy_start_stack_depth;
-	int* yy_start_stack;
-
-	void yy_push_state( int new_state );
-	void yy_pop_state();
-	int yy_top_state();
-
-	yy_state_type yy_get_previous_state();
-	yy_state_type yy_try_NUL_trans( yy_state_type current_state );
-	int yy_get_next_buffer();
-
-	FLEX_STD istream* yyin;	// input source for default LexerInput
-	FLEX_STD ostream* yyout;	// output sink for default LexerOutput
-
-	// yy_hold_char holds the character lost when yytext is formed.
-	char yy_hold_char;
-
-	// Number of characters read into yy_ch_buf.
-	int yy_n_chars;
-
-	// Points to current character in buffer.
-	char* yy_c_buf_p;
-
-	int yy_init;		// whether we need to initialize
-	int yy_start;		// start state number
-
-	// Flag which is used to allow yywrap()'s to do buffer switches
-	// instead of setting up a fresh yyin.  A bit of a hack ...
-	int yy_did_buffer_switch_on_eof;
-
-
-	size_t yy_buffer_stack_top; /**< index of top of stack. */
-	size_t yy_buffer_stack_max; /**< capacity of stack. */
-	struct yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
-	void yyensure_buffer_stack(void);
-
-	// The following are not always needed, but may be depending
-	// on use of certain flex features (like REJECT or yymore()).
-
-	yy_state_type yy_last_accepting_state;
-	char* yy_last_accepting_cpos;
-
-	yy_state_type* yy_state_buf;
-	yy_state_type* yy_state_ptr;
-
-	char* yy_full_match;
-	int* yy_full_state;
-	int yy_full_lp;
-
-	int yy_lp;
-	int yy_looking_for_trail_begin;
-
-	int yy_more_flag;
-	int yy_more_len;
-	int yy_more_offset;
-	int yy_prev_more_offset;
-};
-
-}
-
-#endif // yyFlexLexer || ! yyFlexLexerOnce
-
--- a/src/webui/qjson/json_parser.cc
+++ b/src/webui/qjson/json_parser.cc
--- a/src/webui/qjson/json_parser.hh
+++ b/src/webui/qjson/json_parser.hh
@ -1,300 +0,0 @@
-/* A Bison parser, made by GNU Bison 2.7.  */
-
-/* Skeleton interface for Bison LALR(1) parsers in C++
-   
-      Copyright (C) 2002-2012 Free Software Foundation, Inc.
-   
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* As a special exception, you may create a larger work that contains
-   part or all of the Bison parser skeleton and distribute that work
-   under terms of your choice, so long as that work isn't itself a
-   parser generator using the skeleton or a modified version thereof
-   as a parser skeleton.  Alternatively, if you modify or redistribute
-   the parser skeleton itself, you may (at your option) remove this
-   special exception, which will cause the skeleton and the resulting
-   Bison output files to be licensed under the GNU General Public
-   License without this special exception.
-   
-   This special exception was added by the Free Software Foundation in
-   version 2.2 of Bison.  */
-
-/**
- ** \file json_parser.hh
- ** Define the yy::parser class.
- */
-
-/* C++ LALR(1) parser skeleton written by Akim Demaille.  */
-
-#ifndef YY_YY_JSON_PARSER_HH_INCLUDED
-# define YY_YY_JSON_PARSER_HH_INCLUDED
-
-/* "%code requires" blocks.  */
-/* Line 33 of lalr1.cc  */
-#line 26 "json_parser.yy"
-
-  #include "parser_p.h"
-  #include "json_scanner.h"
-  #include "qjson_debug.h"
-
-  #include <QtCore/QByteArray>
-  #include <QtCore/QMap>
-  #include <QtCore/QString>
-  #include <QtCore/QVariant>
-
-  #include <limits>
-
-  class JSonScanner;
-
-  namespace QJson {
-    class Parser;
-  }
-
-  #define YYERROR_VERBOSE 1
-  
-  Q_DECLARE_METATYPE(QVector<QVariant>*)
-  Q_DECLARE_METATYPE(QVariantMap*)
-
-
-/* Line 33 of lalr1.cc  */
-#line 72 "json_parser.hh"
-
-
-#include <string>
-#include <iostream>
-#include "stack.hh"
-#include "location.hh"
-
-/* Enabling traces.  */
-#ifndef YYDEBUG
-# define YYDEBUG 1
-#endif
-
-
-namespace yy {
-/* Line 33 of lalr1.cc  */
-#line 88 "json_parser.hh"
-
-  /// A Bison parser.
-  class json_parser
-  {
-  public:
-    /// Symbol semantic values.
-#ifndef YYSTYPE
-    typedef int semantic_type;
-#else
-    typedef YYSTYPE semantic_type;
-#endif
-    /// Symbol locations.
-    typedef location location_type;
-    /// Tokens.
-    struct token
-    {
-      /* Tokens.  */
-   enum yytokentype {
-     END = 0,
-     CURLY_BRACKET_OPEN = 1,
-     CURLY_BRACKET_CLOSE = 2,
-     SQUARE_BRACKET_OPEN = 3,
-     SQUARE_BRACKET_CLOSE = 4,
-     COLON = 5,
-     COMMA = 6,
-     NUMBER = 7,
-     TRUE_VAL = 8,
-     FALSE_VAL = 9,
-     NULL_VAL = 10,
-     STRING = 11,
-     INVALID = 12
-   };
-
-    };
-    /// Token type.
-    typedef token::yytokentype token_type;
-
-    /// Build a parser object.
-    json_parser (QJson::ParserPrivate* driver_yyarg);
-    virtual ~json_parser ();
-
-    /// Parse.
-    /// \returns  0 iff parsing succeeded.
-    virtual int parse ();
-
-#if YYDEBUG
-    /// The current debugging stream.
-    std::ostream& debug_stream () const;
-    /// Set the current debugging stream.
-    void set_debug_stream (std::ostream &);
-
-    /// Type for debugging levels.
-    typedef int debug_level_type;
-    /// The current debugging level.
-    debug_level_type debug_level () const;
-    /// Set the current debugging level.
-    void set_debug_level (debug_level_type l);
-#endif
-
-  private:
-    /// Report a syntax error.
-    /// \param loc    where the syntax error is found.
-    /// \param msg    a description of the syntax error.
-    virtual void error (const location_type& loc, const std::string& msg);
-
-    /// Generate an error message.
-    /// \param state   the state where the error occurred.
-    /// \param tok     the lookahead token.
-    virtual std::string yysyntax_error_ (int yystate, int tok);
-
-#if YYDEBUG
-    /// \brief Report a symbol value on the debug stream.
-    /// \param yytype       The token type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yy_symbol_value_print_ (int yytype,
-					 const semantic_type* yyvaluep,
-					 const location_type* yylocationp);
-    /// \brief Report a symbol on the debug stream.
-    /// \param yytype       The token type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    virtual void yy_symbol_print_ (int yytype,
-				   const semantic_type* yyvaluep,
-				   const location_type* yylocationp);
-#endif
-
-
-    /// State numbers.
-    typedef int state_type;
-    /// State stack type.
-    typedef stack<state_type>    state_stack_type;
-    /// Semantic value stack type.
-    typedef stack<semantic_type> semantic_stack_type;
-    /// location stack type.
-    typedef stack<location_type> location_stack_type;
-
-    /// The state stack.
-    state_stack_type yystate_stack_;
-    /// The semantic value stack.
-    semantic_stack_type yysemantic_stack_;
-    /// The location stack.
-    location_stack_type yylocation_stack_;
-
-    /// Whether the given \c yypact_ value indicates a defaulted state.
-    /// \param yyvalue   the value to check
-    static bool yy_pact_value_is_default_ (int yyvalue);
-
-    /// Whether the given \c yytable_ value indicates a syntax error.
-    /// \param yyvalue   the value to check
-    static bool yy_table_value_is_error_ (int yyvalue);
-
-    /// Internal symbol numbers.
-    typedef unsigned char token_number_type;
-    /* Tables.  */
-    /// For a state, the index in \a yytable_ of its portion.
-    static const signed char yypact_[];
-    static const signed char yypact_ninf_;
-
-    /// For a state, default reduction number.
-    /// Unless\a  yytable_ specifies something else to do.
-    /// Zero means the default is an error.
-    static const unsigned char yydefact_[];
-
-    static const signed char yypgoto_[];
-    static const signed char yydefgoto_[];
-
-    /// What to do in a state.
-    /// \a yytable_[yypact_[s]]: what to do in state \a s.
-    /// - if positive, shift that token.
-    /// - if negative, reduce the rule which number is the opposite.
-    /// - if zero, do what YYDEFACT says.
-    static const unsigned char yytable_[];
-    static const signed char yytable_ninf_;
-
-    static const signed char yycheck_[];
-
-    /// For a state, its accessing symbol.
-    static const unsigned char yystos_[];
-
-    /// For a rule, its LHS.
-    static const unsigned char yyr1_[];
-    /// For a rule, its RHS length.
-    static const unsigned char yyr2_[]; 
-
-    /// Convert the symbol name \a n to a form suitable for a diagnostic.
-    static std::string yytnamerr_ (const char *n);
-
-
-    /// For a symbol, its name in clear.
-    static const char* const yytname_[];
-#if YYDEBUG
-    /// A type to store symbol numbers and -1.
-    typedef signed char rhs_number_type;
-    /// A `-1'-separated list of the rules' RHS.
-    static const rhs_number_type yyrhs_[];
-    /// For each rule, the index of the first RHS symbol in \a yyrhs_.
-    static const unsigned char yyprhs_[];
-    /// For each rule, its source line number.
-    static const unsigned char yyrline_[];
-    /// For each scanner token number, its symbol number.
-    static const unsigned short int yytoken_number_[];
-    /// Report on the debug stream that the rule \a r is going to be reduced.
-    virtual void yy_reduce_print_ (int r);
-    /// Print the state stack on the debug stream.
-    virtual void yystack_print_ ();
-
-    /* Debugging.  */
-    int yydebug_;
-    std::ostream* yycdebug_;
-#endif
-
-    /// Convert a scanner token number \a t to a symbol number.
-    token_number_type yytranslate_ (int t);
-
-    /// \brief Reclaim the memory associated to a symbol.
-    /// \param yymsg        Why this token is reclaimed.
-    ///                     If null, do not display the symbol, just free it.
-    /// \param yytype       The symbol type.
-    /// \param yyvaluep     Its semantic value.
-    /// \param yylocationp  Its location.
-    inline void yydestruct_ (const char* yymsg,
-			     int yytype,
-			     semantic_type* yyvaluep,
-			     location_type* yylocationp);
-
-    /// Pop \a n symbols the three stacks.
-    inline void yypop_ (unsigned int n = 1);
-
-    /* Constants.  */
-    static const int yyeof_;
-    /* LAST_ -- Last index in TABLE_.  */
-    static const int yylast_;
-    static const int yynnts_;
-    static const int yyempty_;
-    static const int yyfinal_;
-    static const int yyterror_;
-    static const int yyerrcode_;
-    static const int yyntokens_;
-    static const unsigned int yyuser_token_number_max_;
-    static const token_number_type yyundef_token_;
-
-    /* User arguments.  */
-    QJson::ParserPrivate* driver;
-  };
-
-} // yy
-/* Line 33 of lalr1.cc  */
-#line 297 "json_parser.hh"
-
-
-
-#endif /* !YY_YY_JSON_PARSER_HH_INCLUDED  */
--- a/src/webui/qjson/json_scanner.cc
+++ b/src/webui/qjson/json_scanner.cc
--- a/src/webui/qjson/json_scanner.cpp
+++ b/src/webui/qjson/json_scanner.cpp
@ -1,82 +0,0 @@
-/* This file is part of QJson
- *
- * Copyright (C) 2008 Flavio Castelli <flavio.castelli@gmail.com>
- * Copyright (C) 2013 Silvio Moioli <silvio@moioli.net>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software Foundation.
- * 
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-#include "json_scanner.cc"
-
-#include "qjson_debug.h"
-#include "json_scanner.h"
-#include "json_parser.hh"
-
-#include <ctype.h>
-
-#include <QtCore/QDebug>
-#include <QtCore/QRegExp>
-
-#include <cassert>
-
-
-JSonScanner::JSonScanner(QIODevice* io)
-  : m_allowSpecialNumbers(false),
-    m_io (io),
-    m_criticalError(false),
-    m_C_locale(QLocale::C)
-{
-
-}
-
-JSonScanner::~JSonScanner()
-{
-}
-
-void JSonScanner::allowSpecialNumbers(bool allow) {
-  m_allowSpecialNumbers = allow;
-}
-
-int JSonScanner::yylex(YYSTYPE* yylval, yy::location *yylloc) {
-  m_yylval = yylval;
-  m_yylloc = yylloc;
-  m_yylloc->step();
-  int result = yylex();
-  
-  if (m_criticalError) {
-    return -1;
-  }
-  
-  return result;
-}
-
-int JSonScanner::LexerInput(char* buf, int max_size) {
-  if (!m_io->isOpen()) {
-    qCritical() << "JSonScanner::yylex - io device is not open";
-    m_criticalError = true;
-    return 0;
-  }
-  
-  int readBytes = m_io->read(buf, max_size);
-  if(readBytes < 0) {
-    qCritical() << "JSonScanner::yylex - error while reading from io device";
-    m_criticalError = true;
-    return 0;
-  }
-  
-  return readBytes;
-}
-
-
--- a/src/webui/qjson/json_scanner.h
+++ b/src/webui/qjson/json_scanner.h
@ -1,66 +0,0 @@
-/* This file is part of QJson
- *
- * Copyright (C) 2008 Flavio Castelli <flavio.castelli@gmail.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software Foundation.
- * 
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifndef _JSON_SCANNER
-#define _JSON_SCANNER
-
-#include <QtCore/QIODevice>
-#include <QtCore/QVariant>
-#include <QtCore/QLocale>
-
-#define YYSTYPE QVariant
-
-// Only include FlexLexer.h if it hasn't been already included
-#if ! defined(yyFlexLexerOnce)
-#include <FlexLexer.h>
-#endif
-
-#include "parser_p.h"
-
-
-
-namespace yy {
-  class location;
-  int yylex(YYSTYPE *yylval, yy::location *yylloc, QJson::ParserPrivate* driver);
-}
-
-class JSonScanner : public yyFlexLexer
-{
-    public:
-        explicit JSonScanner(QIODevice* io);
-        ~JSonScanner();
-
-        void allowSpecialNumbers(bool allow);
-
-        int yylex(YYSTYPE* yylval, yy::location *yylloc);
-        int yylex();
-        int LexerInput(char* buf, int max_size);
-    protected:
-        bool m_allowSpecialNumbers;
-        QIODevice* m_io;
-
-        YYSTYPE* m_yylval;
-        yy::location* m_yylloc;
-        bool m_criticalError;
-        QString m_currentString;
-        QLocale m_C_locale;
-};
-
-#endif
--- a/src/webui/qjson/location.hh
+++ b/src/webui/qjson/location.hh
@ -1,181 +0,0 @@
-/* A Bison parser, made by GNU Bison 2.7.  */
-
-/* Locations for Bison parsers in C++
-   
-      Copyright (C) 2002-2007, 2009-2012 Free Software Foundation, Inc.
-   
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* As a special exception, you may create a larger work that contains
-   part or all of the Bison parser skeleton and distribute that work
-   under terms of your choice, so long as that work isn't itself a
-   parser generator using the skeleton or a modified version thereof
-   as a parser skeleton.  Alternatively, if you modify or redistribute
-   the parser skeleton itself, you may (at your option) remove this
-   special exception, which will cause the skeleton and the resulting
-   Bison output files to be licensed under the GNU General Public
-   License without this special exception.
-   
-   This special exception was added by the Free Software Foundation in
-   version 2.2 of Bison.  */
-
-/**
- ** \file location.hh
- ** Define the yy::location class.
- */
-
-#ifndef YY_YY_LOCATION_HH_INCLUDED
-# define YY_YY_LOCATION_HH_INCLUDED
-
-# include "position.hh"
-
-
-namespace yy {
-/* Line 166 of location.cc  */
-#line 47 "location.hh"
-
-  /// Abstract a location.
-  class location
-  {
-  public:
-
-    /// Construct a location from \a b to \a e.
-    location (const position& b, const position& e)
-      : begin (b)
-      , end (e)
-    {
-    }
-
-    /// Construct a 0-width location in \a p.
-    explicit location (const position& p = position ())
-      : begin (p)
-      , end (p)
-    {
-    }
-
-    /// Construct a 0-width location in \a f, \a l, \a c.
-    explicit location (std::string* f,
-                       unsigned int l = 1u,
-                       unsigned int c = 1u)
-      : begin (f, l, c)
-      , end (f, l, c)
-    {
-    }
-
-
-    /// Initialization.
-    void initialize (std::string* f = YY_NULL,
-                     unsigned int l = 1u,
-                     unsigned int c = 1u)
-    {
-      begin.initialize (f, l, c);
-      end = begin;
-    }
-
-    /** \name Line and Column related manipulators
-     ** \{ */
-  public:
-    /// Reset initial location to final location.
-    void step ()
-    {
-      begin = end;
-    }
-
-    /// Extend the current location to the COUNT next columns.
-    void columns (unsigned int count = 1)
-    {
-      end += count;
-    }
-
-    /// Extend the current location to the COUNT next lines.
-    void lines (unsigned int count = 1)
-    {
-      end.lines (count);
-    }
-    /** \} */
-
-
-  public:
-    /// Beginning of the located region.
-    position begin;
-    /// End of the located region.
-    position end;
-  };
-
-  /// Join two location objects to create a location.
-  inline const location operator+ (const location& begin, const location& end)
-  {
-    location res = begin;
-    res.end = end.end;
-    return res;
-  }
-
-  /// Add two location objects.
-  inline const location operator+ (const location& begin, unsigned int width)
-  {
-    location res = begin;
-    res.columns (width);
-    return res;
-  }
-
-  /// Add and assign a location.
-  inline location& operator+= (location& res, unsigned int width)
-  {
-    res.columns (width);
-    return res;
-  }
-
-  /// Compare two location objects.
-  inline bool
-  operator== (const location& loc1, const location& loc2)
-  {
-    return loc1.begin == loc2.begin && loc1.end == loc2.end;
-  }
-
-  /// Compare two location objects.
-  inline bool
-  operator!= (const location& loc1, const location& loc2)
-  {
-    return !(loc1 == loc2);
-  }
-
-  /** \brief Intercept output stream redirection.
-   ** \param ostr the destination output stream
-   ** \param loc a reference to the location to redirect
-   **
-   ** Avoid duplicate information.
-   */
-  template <typename YYChar>
-  inline std::basic_ostream<YYChar>&
-  operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
-  {
-    position last = loc.end - 1;
-    ostr << loc.begin;
-    if (last.filename
-	&& (!loc.begin.filename
-	    || *loc.begin.filename != *last.filename))
-      ostr << '-' << last;
-    else if (loc.begin.line != last.line)
-      ostr << '-' << last.line  << '.' << last.column;
-    else if (loc.begin.column != last.column)
-      ostr << '-' << last.column;
-    return ostr;
-  }
-
-
-} // yy
-/* Line 296 of location.cc  */
-#line 180 "location.hh"
-
-#endif /* !YY_YY_LOCATION_HH_INCLUDED  */
--- a/src/webui/qjson/parser.cpp
+++ b/src/webui/qjson/parser.cpp
@ -1,142 +0,0 @@
-/* This file is part of QJson
- *
- * Copyright (C) 2008 Flavio Castelli <flavio.castelli@gmail.com>
- * Copyright (C) 2016 Anton Kudryavtsev <a.kudryavtsev@netris.ru>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software Foundation.
- * 
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#include "parser.h"
-#include "parser_p.h"
-#include "json_parser.hh"
-#include "json_scanner.h"
-
-#include <QtCore/QBuffer>
-#include <QtCore/QStringList>
-#include <QtCore/QTextStream>
-#include <QtCore/QDebug>
-
-using namespace QJson;
-
-ParserPrivate::ParserPrivate() :
-  m_scanner(0),
-  m_specialNumbersAllowed(false)
-{
-  reset();
-}
-
-ParserPrivate::~ParserPrivate()
-{
-  if (m_scanner)
-    delete m_scanner;
-}
-
-void ParserPrivate::setError(const QString &errorMsg, int errorLine) {
-  m_error = true;
-  m_errorMsg = errorMsg;
-  m_errorLine = errorLine;
-}
-
-void ParserPrivate::reset()
-{
-  m_error = false;
-  m_errorLine = 0;
-  m_errorMsg.clear();
-  if (m_scanner) {
-    delete m_scanner;
-    m_scanner = 0;
-  }
-}
-
-Parser::Parser() :
-    d(new ParserPrivate)
-{
-}
-
-Parser::~Parser()
-{
-  delete d;
-}
-
-QVariant Parser::parse (QIODevice* io, bool* ok)
-{
-  d->reset();
-
-  if (!io->isOpen()) {
-    if (!io->open(QIODevice::ReadOnly)) {
-      if (ok != 0)
-        *ok = false;
-      qCritical ("Error opening device");
-      return QVariant();
-    }
-  }
-
-  if (!io->isReadable()) {
-    if (ok != 0)
-      *ok = false;
-    qCritical ("Device is not readable");
-    io->close();
-    return QVariant();
-  }
-
-  if (io->atEnd()) {
-    if (ok != 0)
-      *ok = false;
-    d->setError(QLatin1String("No data"), 0);
-    io->close();
-    return QVariant();
-  }
-
-  d->m_scanner = new JSonScanner (io);
-  d->m_scanner->allowSpecialNumbers(d->m_specialNumbersAllowed);
-  yy::json_parser parser(d);
-  parser.parse();
-
-  delete d->m_scanner;
-  d->m_scanner = 0;
-
-  if (ok != 0)
-    *ok = !d->m_error;
-
-  io->close();
-  return d->m_result;
-}
-
-QVariant Parser::parse(const QByteArray& jsonString, bool* ok) {
-  QBuffer buffer;
-  buffer.open(QBuffer::ReadWrite | QBuffer::Text);
-  buffer.write(jsonString);
-  buffer.seek(0);
-  return parse (&buffer, ok);
-}
-
-QString Parser::errorString() const
-{
-  return d->m_errorMsg;
-}
-
-int Parser::errorLine() const
-{
-  return d->m_errorLine;
-}
-
-void QJson::Parser::allowSpecialNumbers(bool allowSpecialNumbers) {
-  d->m_specialNumbersAllowed = allowSpecialNumbers;
-}
-
-bool Parser::specialNumbersAllowed() const {
-  return d->m_specialNumbersAllowed;
-}
--- a/src/webui/qjson/parser.h
+++ b/src/webui/qjson/parser.h
@ -1,99 +0,0 @@
-/* This file is part of QJson
- *
- * Copyright (C) 2008 Flavio Castelli <flavio.castelli@gmail.com>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software Foundation.
- * 
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifndef QJSON_PARSER_H
-#define QJSON_PARSER_H
-
-#include "qjson_export.h"
-
-QT_BEGIN_NAMESPACE
-class QIODevice;
-class QVariant;
-QT_END_NAMESPACE
-
-/**
- * Namespace used by QJson
- */
-namespace QJson {
-
-  class ParserPrivate;
-
-  /**
-   * @brief Main class used to convert JSON data to QVariant objects
-   */
-  class QJSON_EXPORT Parser
-  {
-    public:
-      Parser();
-      ~Parser();
-
-      /**
-      * Read JSON string from the I/O Device and converts it to a QVariant object
-      * @param io Input output device
-      * @param ok if a conversion error occurs, *ok is set to false; otherwise *ok is set to true.
-      * @returns a QVariant object generated from the JSON string
-      */
-      QVariant parse(QIODevice* io, bool* ok = 0);
-
-      /**
-      * This is a method provided for convenience.
-      * @param jsonData data containing the JSON object representation
-      * @param ok if a conversion error occurs, *ok is set to false; otherwise *ok is set to true.
-      * @returns a QVariant object generated from the JSON string
-      * @sa errorString
-      * @sa errorLine
-      */
-      QVariant parse(const QByteArray& jsonData, bool* ok = 0);
-
-      /**
-      * This method returns the error message
-      * @returns a QString object containing the error message of the last parse operation
-      * @sa errorLine
-      */
-      QString errorString() const;
-
-      /**
-      * This method returns line number where the error occurred
-      * @returns the line number where the error occurred
-      * @sa errorString
-      */
-      int errorLine() const;
-
-      /**
-       * Sets whether special numbers (Infinity, -Infinity, NaN) are allowed as an extension to
-       * the standard
-       * @param  allowSpecialNumbers new value of whether special numbers are allowed
-       * @sa specialNumbersAllowed
-       */
-      void allowSpecialNumbers(bool allowSpecialNumbers);
-
-      /**
-       * @returns whether special numbers (Infinity, -Infinity, NaN) are allowed
-       * @sa allowSpecialNumbers
-       */
-      bool specialNumbersAllowed() const;
-
-    private:
-      Q_DISABLE_COPY(Parser)
-      ParserPrivate* const d;
-  };
-}
-
-#endif // QJSON_PARSER_H
--- a/src/webui/qjson/parser_p.h
+++ b/src/webui/qjson/parser_p.h
@ -1,57 +0,0 @@
-/* This file is part of QJson
- *
- * Copyright (C) 2008 Flavio Castelli <flavio.castelli@gmail.com>
- * Copyright (C) 2009 Michael Leupold <lemma@confuego.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License version 2.1, as published by the Free Software Foundation.
- * 
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifndef QJSON_PARSER_P_H
-#define QJSON_PARSER_P_H
-
-#include "parser.h"
-
-#include <QtCore/QString>
-#include <QtCore/QVariant>
-
-class JSonScanner;
-
-namespace yy {
-  class json_parser;
-}
-
-namespace QJson {
-
-  class ParserPrivate
-  {
-    public:
-      ParserPrivate();
-      ~ParserPrivate();
-
-      void reset();
-
-      void setError(const QString &errorMsg, int line);
-
-      JSonScanner* m_scanner;
-      bool m_error;
-      int m_errorLine;
-      QString m_errorMsg;
-      QVariant m_result;
-      bool m_specialNumbersAllowed;
-  };
-}
-
-#endif // QJSON_PARSER_H
--- a/src/webui/qjson/position.hh
+++ b/src/webui/qjson/position.hh
@ -1,172 +0,0 @@
-/* A Bison parser, made by GNU Bison 2.7.  */
-
-/* Positions for Bison parsers in C++
-   
-      Copyright (C) 2002-2007, 2009-2012 Free Software Foundation, Inc.
-   
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* As a special exception, you may create a larger work that contains
-   part or all of the Bison parser skeleton and distribute that work
-   under terms of your choice, so long as that work isn't itself a
-   parser generator using the skeleton or a modified version thereof
-   as a parser skeleton.  Alternatively, if you modify or redistribute
-   the parser skeleton itself, you may (at your option) remove this
-   special exception, which will cause the skeleton and the resulting
-   Bison output files to be licensed under the GNU General Public
-   License without this special exception.
-   
-   This special exception was added by the Free Software Foundation in
-   version 2.2 of Bison.  */
-
-/**
- ** \file position.hh
- ** Define the yy::position class.
- */
-
-#ifndef YY_YY_POSITION_HH_INCLUDED
-# define YY_YY_POSITION_HH_INCLUDED
-
-# include <algorithm> // std::max
-# include <iostream>
-# include <string>
-
-# ifndef YY_NULL
-#  if defined __cplusplus && 201103L <= __cplusplus
-#   define YY_NULL nullptr
-#  else
-#   define YY_NULL 0
-#  endif
-# endif
-
-
-namespace yy {
-/* Line 36 of location.cc  */
-#line 57 "position.hh"
-  /// Abstract a position.
-  class position
-  {
-  public:
-
-    /// Construct a position.
-    explicit position (std::string* f = YY_NULL,
-                       unsigned int l = 1u,
-                       unsigned int c = 1u)
-      : filename (f)
-      , line (l)
-      , column (c)
-    {
-    }
-
-
-    /// Initialization.
-    void initialize (std::string* fn = YY_NULL,
-                     unsigned int l = 1u,
-                     unsigned int c = 1u)
-    {
-      filename = fn;
-      line = l;
-      column = c;
-    }
-
-    /** \name Line and Column related manipulators
-     ** \{ */
-    /// (line related) Advance to the COUNT next lines.
-    void lines (int count = 1)
-    {
-      column = 1u;
-      line += count;
-    }
-
-    /// (column related) Advance to the COUNT next columns.
-    void columns (int count = 1)
-    {
-      column = std::max (1u, column + count);
-    }
-    /** \} */
-
-    /// File name to which this position refers.
-    std::string* filename;
-    /// Current line number.
-    unsigned int line;
-    /// Current column number.
-    unsigned int column;
-  };
-
-  /// Add and assign a position.
-  inline position&
-  operator+= (position& res, const int width)
-  {
-    res.columns (width);
-    return res;
-  }
-
-  /// Add two position objects.
-  inline const position
-  operator+ (const position& begin, const int width)
-  {
-    position res = begin;
-    return res += width;
-  }
-
-  /// Add and assign a position.
-  inline position&
-  operator-= (position& res, const int width)
-  {
-    return res += -width;
-  }
-
-  /// Add two position objects.
-  inline const position
-  operator- (const position& begin, const int width)
-  {
-    return begin + -width;
-  }
-
-  /// Compare two position objects.
-  inline bool
-  operator== (const position& pos1, const position& pos2)
-  {
-    return (pos1.line == pos2.line
-            && pos1.column == pos2.column
-            && (pos1.filename == pos2.filename
-                || (pos1.filename && pos2.filename
-                    && *pos1.filename == *pos2.filename)));
-  }
-
-  /// Compare two position objects.
-  inline bool
-  operator!= (const position& pos1, const position& pos2)
-  {
-    return !(pos1 == pos2);
-  }
-
-  /** \brief Intercept output stream redirection.
-   ** \param ostr the destination output stream
-   ** \param pos a reference to the position to redirect
-   */
-  template <typename YYChar>
-  inline std::basic_ostream<YYChar>&
-  operator<< (std::basic_ostream<YYChar>& ostr, const position& pos)
-  {
-    if (pos.filename)
-      ostr << *pos.filename << ':';
-    return ostr << pos.line << '.' << pos.column;
-  }
-
-
-} // yy
-/* Line 148 of location.cc  */
-#line 172 "position.hh"
-#endif /* !YY_YY_POSITION_HH_INCLUDED  */
--- a/src/webui/qjson/qjson.pri
+++ b/src/webui/qjson/qjson.pri
@ -1,19 +0,0 @@
-INCLUDEPATH += $$PWD
-
-HEADERS += $$PWD/FlexLexer.h \
-           $$PWD/stack.hh \
-           $$PWD/position.hh \
-           $$PWD/location.hh \
-           $$PWD/json_parser.hh \
-           $$PWD/json_scanner.h \
-           $$PWD/parser.h \
-           $$PWD/parser_p.h \
-           $$PWD_debug.h \
-           $$PWD_export.h \
-           $$PWD/serializer.h
-
-SOURCES += $$PWD/json_parser.cc \
-           $$PWD/json_scanner.cc \
-           $$PWD/json_scanner.cpp \
-           $$PWD/parser.cpp \
-           $$PWD/serializer.cpp
--- a/src/webui/qjson/qjson_debug.h
+++ b/src/webui/qjson/qjson_debug.h
@ -1,34 +0,0 @@
-/* This file is part of qjson
-  *
-  * Copyright (C) 2009 Michael Leupold <lemma@confuego.org>
-  * Copyright (C) 2013 Silvio Moioli <silvio@moioli.net>
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License version 2.1, as published by the Free Software Foundation.
-  * 
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public License
-  * along with this library; see the file COPYING.LIB.  If not, write to
-  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-  * Boston, MA 02110-1301, USA.
-  */
-
-#ifndef QJSON_DEBUG_H
-#define QJSON_DEBUG_H
-
-#include <QtCore/QDebug>
-
-// define qjsonDebug()
-#ifdef QJSON_VERBOSE_DEBUG_OUTPUT
-  inline QDebug qjsonDebug() { return QDebug(QtDebugMsg); }
-#else
-  #define qjsonDebug() if(false) QDebug(QtDebugMsg)
-#endif
-
-#endif
--- a/src/webui/qjson/qjson_export.h
+++ b/src/webui/qjson/qjson_export.h
@ -1,37 +0,0 @@
-/*
- * Bittorrent Client using Qt and libtorrent.
- * Copyright (C) 2014  Vladimir Golovnev
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- *
- * In addition, as a special exception, the copyright holders give permission to
- * link this program with the OpenSSL project's "OpenSSL" library (or with
- * modified versions of it that use the same license as the "OpenSSL" library),
- * and distribute the linked executables. You must obey the GNU General Public
- * License in all respects for all of the code used other than "OpenSSL".  If you
- * modify file(s), you may extend this exception to your version of the file(s),
- * but you are not obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- *
- * Contact : glassez@yandex.ru
- */
-
-#ifndef QJSON_EXPORT_H
-#define QJSON_EXPORT_H
-
-#include <qglobal.h>
-#define QJSON_EXPORT
-
-#endif
--- a/src/webui/qjson/serializer.cpp
+++ b/src/webui/qjson/serializer.cpp
@ -1,469 +0,0 @@
-/* This file is part of qjson
-  *
-  * Copyright (C) 2009 Till Adam <adam@kde.org>
-  * Copyright (C) 2009 Flavio Castelli <flavio@castelli.name>
-  * Copyright (C) 2016 Anton Kudryavtsev <a.kudryavtsev@netris.ru>
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License version 2.1, as published by the Free Software Foundation.
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public License
-  * along with this library; see the file COPYING.LIB.  If not, write to
-  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-  * Boston, MA 02110-1301, USA.
-  */
-
-#include "serializer.h"
-
-#include <QtCore/QDataStream>
-#include <QtCore/QStringList>
-#include <QtCore/QVariant>
-
-// cmath does #undef for isnan and isinf macroses what can be defined in math.h
-#if defined(Q_OS_SYMBIAN) || defined(Q_OS_ANDROID) || defined(Q_OS_BLACKBERRY) || defined(Q_OS_SOLARIS)
-# include <math.h>
-#else
-# include <cmath>
-#endif
-
-#ifdef Q_OS_SOLARIS
-# ifndef isinf
-#  include <ieeefp.h>
-#  define isinf(x) (!finite((x)) && (x)==(x))
-# endif
-#endif
-
-#ifdef _MSC_VER  // using MSVC compiler
-#include <float.h>
-#endif
-
-using namespace QJson;
-
-class Serializer::SerializerPrivate {
-  public:
-    SerializerPrivate() :
-      specialNumbersAllowed(false),
-      indentMode(QJson::IndentNone),
-      doublePrecision(6) {
-        errorMessage.clear();
-    }
-    QString errorMessage;
-    bool specialNumbersAllowed;
-    IndentMode indentMode;
-    int doublePrecision;
-
-    QByteArray serialize( const QVariant &v, bool *ok, int indentLevel = 0);
-
-    static QByteArray buildIndent(int spaces);
-    static QByteArray escapeString( const QString& str );
-    static QByteArray join( const QList<QByteArray>& list, const QByteArray& sep );
-    static QByteArray join( const QList<QByteArray>& list, char sep );
-};
-
-QByteArray Serializer::SerializerPrivate::join( const QList<QByteArray>& list, const QByteArray& sep ) {
-  QByteArray res;
-  Q_FOREACH( const QByteArray& i, list ) {
-    if ( !res.isEmpty() )
-      res += sep;
-    res += i;
-  }
-  return res;
-}
-
-QByteArray Serializer::SerializerPrivate::join( const QList<QByteArray>& list, char sep ) {
-  QByteArray res;
-  Q_FOREACH( const QByteArray& i, list ) {
-    if ( !res.isEmpty() )
-      res += sep;
-    res += i;
-  }
-  return res;
-}
-
-QByteArray Serializer::SerializerPrivate::serialize( const QVariant &v, bool *ok, int indentLevel)
-{
-  QByteArray str;
-  const QVariant::Type type = v.type();
-
-  if ( ! v.isValid() ) { // invalid or null?
-    str = "null";
-  } else if (( type == QVariant::List ) || ( type == QVariant::StringList )) { // an array or a stringlist?
-    const QVariantList list = v.toList();
-    QList<QByteArray> values;
-    Q_FOREACH( const QVariant& var, list )
-    {
-      QByteArray serializedValue;
-
-      serializedValue = serialize( var, ok, indentLevel+1);
-
-      if ( !*ok ) {
-        break;
-      }
-      switch(indentMode) {
-        case QJson::IndentFull :
-        case QJson::IndentMedium :
-        case QJson::IndentMinimum :
-          values << serializedValue;
-          break;
-        case QJson::IndentCompact :
-        case QJson::IndentNone :
-        default:
-          values << serializedValue.trimmed();
-          break;
-      }
-    }
-
-    if (indentMode == QJson::IndentMedium || indentMode == QJson::IndentFull ) {
-      QByteArray indent = buildIndent(indentLevel);
-      str = indent + "[\n" + join( values, ",\n" ) + '\n' + indent + ']';
-    }
-    else if (indentMode == QJson::IndentMinimum) {
-      QByteArray indent = buildIndent(indentLevel);
-      str = indent + "[\n" + join( values, ",\n" ) + '\n' + indent + ']';
-    }
-    else if (indentMode == QJson::IndentCompact) {
-      str = '[' + join( values, "," ) + ']';
-    }
-    else {
-      str = "[ " + join( values, ", " ) + " ]";
-    }
-
-  } else if ( type == QVariant::Map ) { // variant is a map?
-    const QVariantMap vmap = v.toMap();
-
-    if (indentMode == QJson::IndentMinimum) {
-      QByteArray indent = buildIndent(indentLevel);
-      str = indent + "{ ";
-    }
-    else if (indentMode == QJson::IndentMedium || indentMode == QJson::IndentFull) {
-      QByteArray indent = buildIndent(indentLevel);
-      QByteArray nextindent = buildIndent(indentLevel + 1);
-      str = indent + "{\n" + nextindent;
-    }
-    else if (indentMode == QJson::IndentCompact) {
-      str = "{";
-    }
-    else {
-      str = "{ ";
-    }
-
-    QList<QByteArray> pairs;
-    for (QVariantMap::const_iterator it = vmap.begin(), end = vmap.end(); it != end; ++it) {
-      indentLevel++;
-      QByteArray serializedValue = serialize( it.value(), ok, indentLevel);
-      indentLevel--;
-      if ( !*ok ) {
-        break;
-      }
-      QByteArray key   = escapeString( it.key() );
-      QByteArray value = serializedValue.trimmed();
-      if (indentMode == QJson::IndentCompact) {
-        pairs << key + ':' + value;
-      } else {
-        pairs << key + " : " + value;
-      }
-    }
-
-    if (indentMode == QJson::IndentFull) {
-      QByteArray indent = buildIndent(indentLevel + 1);
-      str += join( pairs, ",\n" + indent);
-    }
-    else if (indentMode == QJson::IndentCompact) {
-      str += join( pairs, ',' );
-    }
-    else {
-      str += join( pairs, ", " );
-    }
-
-    if (indentMode == QJson::IndentMedium || indentMode == QJson::IndentFull) {
-      QByteArray indent = buildIndent(indentLevel);
-      str += '\n' + indent + '}';
-    }
-    else if (indentMode == QJson::IndentCompact) {
-      str += '}';
-    }
-    else {
-      str += " }";
-    }
-
-  } else if ( type == QVariant::Hash ) { // variant is a hash?
-    const QVariantHash vhash = v.toHash();
-
-    if (indentMode == QJson::IndentMinimum) {
-      QByteArray indent = buildIndent(indentLevel);
-      str = indent + "{ ";
-    }
-    else if (indentMode == QJson::IndentMedium || indentMode == QJson::IndentFull) {
-      QByteArray indent = buildIndent(indentLevel);
-      QByteArray nextindent = buildIndent(indentLevel + 1);
-      str = indent + "{\n" + nextindent;
-    }
-    else if (indentMode == QJson::IndentCompact) {
-      str = "{";
-    }
-    else {
-      str = "{ ";
-    }
-
-    QList<QByteArray> pairs;
-    for (QVariantHash::const_iterator it = vhash.begin(), end = vhash.end(); it != end; ++it) {
-      QByteArray serializedValue = serialize( it.value(), ok, indentLevel + 1);
-
-      if ( !*ok ) {
-        break;
-      }
-      QByteArray key   = escapeString( it.key() );
-      QByteArray value = serializedValue.trimmed();
-      if (indentMode == QJson::IndentCompact) {
-        pairs << key + ':' + value;
-      } else {
-        pairs << key + " : " + value;
-      }
-    }
-
-    if (indentMode == QJson::IndentFull) {
-      QByteArray indent = buildIndent(indentLevel + 1);
-      str += join( pairs, ",\n" + indent);
-    }
-    else if (indentMode == QJson::IndentCompact) {
-      str += join( pairs, ',' );
-    }
-    else {
-      str += join( pairs, ", " );
-    }
-
-    if (indentMode == QJson::IndentMedium || indentMode == QJson::IndentFull) {
-      QByteArray indent = buildIndent(indentLevel);
-      str += '\n' + indent + '}';
-    }
-    else if (indentMode == QJson::IndentCompact) {
-      str += '}';
-    }
-    else {
-      str += " }";
-    }
-
-  } else {
-    // Add indent, we may need to remove it later for some layouts
-    switch(indentMode) {
-      case QJson::IndentFull :
-      case QJson::IndentMedium :
-      case QJson::IndentMinimum :
-        str += buildIndent(indentLevel);
-        break;
-      case QJson::IndentCompact :
-      case QJson::IndentNone :
-      default:
-        break;
-    }
-
-    if (( type == QVariant::String ) ||  ( type == QVariant::ByteArray )) { // a string or a byte array?
-      str += escapeString( v.toString() );
-    } else if (( type == QVariant::Double) || ((QMetaType::Type)type == QMetaType::Float)) { // a double or a float?
-      const double value = v.toDouble();
-  #if defined _WIN32 && !defined(Q_OS_SYMBIAN)
-      const bool special = _isnan(value) || !_finite(value);
-  #elif defined(Q_OS_SYMBIAN) || defined(Q_OS_ANDROID) || defined(Q_OS_BLACKBERRY) || defined(Q_OS_SOLARIS)
-      const bool special = isnan(value) || isinf(value);
-  #else
-      const bool special = std::isnan(value) || std::isinf(value);
-  #endif
-      if (special) {
-        if (specialNumbersAllowed) {
-  #if defined _WIN32 && !defined(Q_OS_SYMBIAN)
-          if (_isnan(value)) {
-  #elif defined(Q_OS_SYMBIAN) || defined(Q_OS_ANDROID) || defined(Q_OS_BLACKBERRY) || defined(Q_OS_SOLARIS)
-          if (isnan(value)) {
-  #else
-          if (std::isnan(value)) {
-  #endif
-            str += "NaN";
-          } else {
-            if (value<0) {
-              str += '-';
-            }
-            str += "Infinity";
-          }
-        } else {
-          errorMessage += QLatin1String("Attempt to write NaN or infinity, which is not supported by json\n");
-          *ok = false;
-      }
-      } else {
-        str = QByteArray::number( value , 'g', doublePrecision);
-        if( !str.contains( '.' ) && !str.contains( 'e' ) ) {
-          str += ".0";
-        }
-      }
-    } else if ( type == QVariant::Bool ) { // boolean value?
-      str += ( v.toBool() ? "true" : "false" );
-    } else if ( type == QVariant::ULongLong ) { // large unsigned number?
-      str += QByteArray::number( v.value<qulonglong>() );
-    } else if ( type == QVariant::UInt ) { // unsigned int number?
-      str += QByteArray::number( v.value<quint32>() );
-    } else if ( v.canConvert<qlonglong>() ) { // any signed number?
-      str += QByteArray::number( v.value<qlonglong>() );
-    } else if ( v.canConvert<int>() ) { // unsigned short number?
-      str += QByteArray::number( v.value<int>() );
-    } else if ( v.canConvert<QString>() ){ // can value be converted to string?
-      // this will catch QDate, QDateTime, QUrl, ...
-      str += escapeString( v.toString() );
-      //TODO: catch other values like QImage, QRect, ...
-    } else {
-      *ok = false;
-      errorMessage += QLatin1String("Cannot serialize ");
-      errorMessage += v.toString();
-      errorMessage += QLatin1String(" because type ");
-      errorMessage += QLatin1String(v.typeName());
-      errorMessage += QLatin1String(" is not supported by QJson\n");
-    }
-  }
-  if ( *ok )
-  {
-    return str;
-  }
-  else
-    return QByteArray();
-}
-
-QByteArray Serializer::SerializerPrivate::buildIndent(int spaces)
-{
-   QByteArray indent;
-   if (spaces < 0) {
-     spaces = 0;
-   }
-   for (int i = 0; i < spaces; i++ ) {
-     indent += ' ';
-   }
-   return indent;
-}
-
-QByteArray Serializer::SerializerPrivate::escapeString( const QString& str )
-{
-  QByteArray result;
-  result.reserve(str.size() + 2);
-  result.append('\"');
-  for (QString::const_iterator it = str.begin(), end = str.end(); it != end; ++it) {
-    ushort unicode = it->unicode();
-    switch ( unicode ) {
-      case '\"':
-        result.append("\\\"");
-        break;
-      case '\\':
-        result.append("\\\\");
-        break;
-      case '\b':
-        result.append("\\b");
-        break;
-      case '\f':
-        result.append("\\f");
-        break;
-      case '\n':
-        result.append("\\n");
-        break;
-      case '\r':
-        result.append("\\r");
-        break;
-      case '\t':
-        result.append("\\t");
-        break;
-      default:
-        if ( unicode > 0x1F && unicode < 128 ) {
-          result.append(static_cast<char>(unicode));
-        } else {
-          char escaped[7];
-          qsnprintf(escaped, sizeof(escaped)/sizeof(char), "\\u%04x", unicode);
-          result.append(escaped);
-        }
-    }
-  }
-  result.append('\"');
-  return result;
-}
-
-Serializer::Serializer()
-  : d( new SerializerPrivate )
-{
-}
-
-Serializer::~Serializer() {
-  delete d;
-}
-
-void Serializer::serialize( const QVariant& v, QIODevice* io, bool* ok)
-{
-  Q_ASSERT( io );
-  *ok = true;
-
-  if (!io->isOpen()) {
-    if (!io->open(QIODevice::WriteOnly)) {
-      d->errorMessage = QLatin1String("Error opening device");
-      *ok = false;
-      return;
-    }
-  }
-
-  if (!io->isWritable()) {
-    d->errorMessage = QLatin1String("Device is not readable");
-    io->close();
-    *ok = false;
-    return;
-  }
-
-  const QByteArray str = serialize( v, ok);
-  if (*ok && (io->write(str) != str.count())) {
-    *ok = false;
-    d->errorMessage = QLatin1String("Something went wrong while writing to IO device");
-  }
-}
-
-QByteArray Serializer::serialize( const QVariant &v)
-{
-  bool ok;
-
-  return serialize(v, &ok);
-}
-
-QByteArray Serializer::serialize( const QVariant &v, bool *ok)
-{
-  bool _ok = true;
-  d->errorMessage.clear();
-
-  if (ok) {
-    *ok = true;
-  } else {
-    ok = &_ok;
-  }
-
-  return d->serialize(v, ok);
-}
-
-void QJson::Serializer::allowSpecialNumbers(bool allow) {
-  d->specialNumbersAllowed = allow;
-}
-
-bool QJson::Serializer::specialNumbersAllowed() const {
-  return d->specialNumbersAllowed;
-}
-
-void QJson::Serializer::setIndentMode(IndentMode mode) {
-  d->indentMode = mode;
-}
-
-void QJson::Serializer::setDoublePrecision(int precision) {
-  d->doublePrecision = precision;
-}
-
-IndentMode QJson::Serializer::indentMode() const {
-  return d->indentMode;
-}
-
-QString QJson::Serializer::errorMessage() const {
-  return d->errorMessage;
-}
-
--- a/src/webui/qjson/serializer.h
+++ b/src/webui/qjson/serializer.h
@ -1,230 +0,0 @@
-/* This file is part of qjson
-  *
-  * Copyright (C) 2009 Till Adam <adam@kde.org>
-  *
-  * This library is free software; you can redistribute it and/or
-  * modify it under the terms of the GNU Lesser General Public
-  * License version 2.1, as published by the Free Software Foundation.
-  * 
-  *
-  * This library is distributed in the hope that it will be useful,
-  * but WITHOUT ANY WARRANTY; without even the implied warranty of
-  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-  * Lesser General Public License for more details.
-  *
-  * You should have received a copy of the GNU Lesser General Public License
-  * along with this library; see the file COPYING.LIB.  If not, write to
-  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
-  * Boston, MA 02110-1301, USA.
-  */
-
-#ifndef QJSON_SERIALIZER_H
-#define QJSON_SERIALIZER_H
-
-#include "qjson_export.h"
-
-QT_BEGIN_NAMESPACE
-class QIODevice;
-class QString;
-class QVariant;
-QT_END_NAMESPACE
-
-namespace QJson {
-  /**
-   @brief How the indentation should work.
-   \verbatim
-   none (default) :
-            { "foo" : 0, "foo1" : 1, "foo2" : [ { "bar" : 1, "foo" : 0, "foobar" : 0 }, { "bar" : 1, "foo" : 1, "foobar" : 1 } ], "foo3" : [ 1, 2, 3, 4, 5, 6 ] }
-  
-   compact :
-            {"foo":0,"foo1":1,"foo2":[{"bar":1,"foo":0,"foobar":0},{"bar":1,"foo":1,"foobar":1}],"foo3":[1,2,3,4,5,6]}
-  
-   minimum :
-            { "foo" : 0, "foo1" : 1, "foo2" : [
-              { "bar" : 1, "foo" : 0, "foobar" : 0 },
-              { "bar" : 1, "foo" : 1, "foobar" : 1 }
-             ], "foo3" : [
-              1,
-              2,
-              3,
-              4,
-              5,
-              6
-             ] }
-
-   medium :
-            {
-             "foo" : 0, "foo1" : 1, "foo2" : [
-              {
-               "bar" : 1, "foo" : 0, "foobar" : 0
-              },
-              {
-               "bar" : 1, "foo" : 1, "foobar" : 1
-              }
-             ], "foo3" : [
-              1,
-              2,
-              3,
-              4,
-              5,
-              6
-             ]
-            }
-
-   full :
-            {
-             "foo" : 0,
-             "foo1" : 1,
-             "foo2" : [
-              {
-               "bar" : 1,
-               "foo" : 0,
-               "foobar" : 0
-              },
-              {
-               "bar" : 1,
-               "foo" : 1,
-               "foobar" : 1
-              }
-             ],
-             "foo3" : [
-              1,
-              2,
-              3,
-              4,
-              5,
-              6
-             ]
-            }
-
-  
-   \endverbatim
-  */
-  enum IndentMode {
-    IndentNone,
-    IndentCompact,
-    IndentMinimum,
-    IndentMedium,
-    IndentFull
-  };
-  /**
-  * @brief Main class used to convert QVariant objects to JSON data.
-  *
-  * QVariant objects are converted to a string containing the JSON data.
-  *
-  *
-  * Usage:
-  *
-  * \code
-  * QVariantList people;
-  *
-  * QVariantMap bob;
-  * bob.insert("Name", "Bob");
-  * bob.insert("Phonenumber", 123);
-  *
-  * QVariantMap alice;
-  * alice.insert("Name", "Alice");
-  * alice.insert("Phonenumber", 321);
-  *
-  * people << bob << alice;
-  *
-  * QJson::Serializer serializer;
-  * bool ok;
-  * QByteArray json = serializer.serialize(people, &ok);
-  *
-  * if (ok) {
-  *   qDebug() << json;
-  * } else {
-  *   qCritical() << "Something went wrong:" << serializer.errorMessage();
-  * }
-  * \endcode
-  *
-  * The output will be:
-  *
-  * \code
-  *  "[ { "Name" : "Bob", "Phonenumber" : 123 },
-  *     { "Name" : "Alice", "Phonenumber" : 321 } ]"
-  * \endcode
-  *
-  * It's possible to tune the indentation level of the resulting string. \sa setIndentMode
-  */
-  class QJSON_EXPORT Serializer {
-  public:
-    Serializer();
-    ~Serializer();
-
-     /**
-      * This method generates a textual JSON representation and outputs it to the
-      * passed in I/O Device.
-      * @param variant The JSON document in its in-memory representation as generated by the
-      * parser.
-      * @param out Input output device
-      * @param ok if a conversion error occurs, *ok is set to false; otherwise *ok is set to true
-      */
-    void serialize( const QVariant& variant, QIODevice* out, bool* ok);
-
-    /**
-      * This is a method provided for convenience. It turns the passed in in-memory
-      * representation of the JSON document into a textual one, which is returned.
-      * If the returned string is empty, the document was empty. If it was null, there
-      * was a parsing error.
-      *
-      * @param variant The JSON document in its in-memory representation as generated by the
-      * parser.
-      *
-      * \deprecated This method is going to be removed with the next major release of QJson.
-      */
-    QByteArray serialize( const QVariant& variant);
-
-    /**
-      * This is a method provided for convenience. It turns the passed in in-memory
-      * representation of the JSON document into a textual one, which is returned.
-      * If the returned string is empty, the document was empty. If it was null, there
-      * was a parsing error.
-      *
-      * @param variant The JSON document in its in-memory representation as generated by the
-      * parser.
-      * @param ok if a conversion error occurs, *ok is set to false; otherwise *ok is set to true
-      */
-    QByteArray serialize( const QVariant& variant, bool *ok);
-
-    /**
-     * Allow or disallow writing of NaN and/or Infinity (as an extension to QJson)
-     */
-    void allowSpecialNumbers(bool allow);
-
-    /**
-     * Is Nan and/or Infinity allowed?
-     */
-    bool specialNumbersAllowed() const;
-
-    /**
-     * set output indentation mode as defined in QJson::IndentMode
-     */
-    void setIndentMode(IndentMode mode = QJson::IndentNone);
-
-
-    /**
-    * set double precision used while converting Double
-    * \sa QByteArray::number
-    */
-    void setDoublePrecision(int precision);
-
-    /**
-     * Returns one of the indentation modes defined in QJson::IndentMode
-     */
-    IndentMode indentMode() const;
-
-    /**
-     * Returns the error message
-     */
-    QString errorMessage() const;
-
-  private:
-    Q_DISABLE_COPY(Serializer)
-    class SerializerPrivate;
-    SerializerPrivate* const d;
-  };
-}
-
-#endif // QJSON_SERIALIZER_H
--- a/src/webui/qjson/stack.hh
+++ b/src/webui/qjson/stack.hh
@ -1,133 +0,0 @@
-/* A Bison parser, made by GNU Bison 2.7.  */
-
-/* Stack handling for Bison parsers in C++
-   
-      Copyright (C) 2002-2012 Free Software Foundation, Inc.
-   
-   This program is free software: you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation, either version 3 of the License, or
-   (at your option) any later version.
-   
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-   
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-/* As a special exception, you may create a larger work that contains
-   part or all of the Bison parser skeleton and distribute that work
-   under terms of your choice, so long as that work isn't itself a
-   parser generator using the skeleton or a modified version thereof
-   as a parser skeleton.  Alternatively, if you modify or redistribute
-   the parser skeleton itself, you may (at your option) remove this
-   special exception, which will cause the skeleton and the resulting
-   Bison output files to be licensed under the GNU General Public
-   License without this special exception.
-   
-   This special exception was added by the Free Software Foundation in
-   version 2.2 of Bison.  */
-
-/**
- ** \file stack.hh
- ** Define the yy::stack class.
- */
-
-#ifndef YY_YY_STACK_HH_INCLUDED
-# define YY_YY_STACK_HH_INCLUDED
-
-# include <deque>
-
-
-namespace yy {
-/* Line 34 of stack.hh  */
-#line 47 "stack.hh"
-  template <class T, class S = std::deque<T> >
-  class stack
-  {
-  public:
-    // Hide our reversed order.
-    typedef typename S::reverse_iterator iterator;
-    typedef typename S::const_reverse_iterator const_iterator;
-
-    stack () : seq_ ()
-    {
-    }
-
-    stack (unsigned int n) : seq_ (n)
-    {
-    }
-
-    inline
-    T&
-    operator [] (unsigned int i)
-    {
-      return seq_[i];
-    }
-
-    inline
-    const T&
-    operator [] (unsigned int i) const
-    {
-      return seq_[i];
-    }
-
-    inline
-    void
-    push (const T& t)
-    {
-      seq_.push_front (t);
-    }
-
-    inline
-    void
-    pop (unsigned int n = 1)
-    {
-      for (; n; --n)
-        seq_.pop_front ();
-    }
-
-    inline
-    unsigned int
-    height () const
-    {
-      return seq_.size ();
-    }
-
-    inline const_iterator begin () const { return seq_.rbegin (); }
-    inline const_iterator end () const { return seq_.rend (); }
-
-  private:
-    S seq_;
-  };
-
-  /// Present a slice of the top of a stack.
-  template <class T, class S = stack<T> >
-  class slice
-  {
-  public:
-    slice (const S& stack, unsigned int range)
-      : stack_ (stack)
-      , range_ (range)
-    {
-    }
-
-    inline
-    const T&
-    operator [] (unsigned int i) const
-    {
-      return stack_[range_ - i];
-    }
-
-  private:
-    const S& stack_;
-    unsigned int range_;
-  };
-
-} // yy
-/* Line 116 of stack.hh  */
-#line 132 "stack.hh"
-
-#endif /* !YY_YY_STACK_HH_INCLUDED  */
--- a/src/webui/webui.pri
+++ b/src/webui/webui.pri
@ -15,10 +15,4 @@ SOURCES += \
    $$PWD/webapplication.cpp \
    $$PWD/abstractwebapplication.cpp

-# QJson JSON parser/serializer for using with Qt4
-lessThan(QT_MAJOR_VERSION, 5) {
-    !usesystemqjson: include(qjson/qjson.pri)
-    else: DEFINES += USE_SYSTEM_QJSON
-}
-
 RESOURCES += $$PWD/webui.qrc