From: rnv <rnv@opencascade.com>
Date: Thu, 30 May 2019 11:59:57 +0000 (+0300)
Subject: Remove QT4 compatibility.
X-Git-Tag: V9_4_0a1~8
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=944a88161c28aa3414d534728169b4f21f68de47;p=modules%2Fgui.git

Remove QT4 compatibility.
---

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 874bd0835..c70185f65 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -72,7 +72,6 @@ SET(BUILD_SHARED_LIBS TRUE)
 OPTION(SALOME_BUILD_DOC "Generate SALOME GUI documentation" ON)
 OPTION(SALOME_BUILD_TESTS "Build SALOME tests" ON)
 OPTION(SALOME_GUI_USE_OBSERVERS "Use study observers in GUI (advanced)" ON)
-OPTION(SALOME_BUILD_WITH_QT5 "Build SALOME with Qt 5" ON)
 CMAKE_DEPENDENT_OPTION(SALOME_GUI_BUILD_FRENCH_DOC "Generate SALOME GUI French documentation" OFF
                        "SALOME_BUILD_DOC" OFF)
 
@@ -160,31 +159,20 @@ IF(SALOME_USE_OCCVIEWER OR SALOME_USE_VTKVIEWER OR SALOME_USE_GLVIEWER)
 ENDIF()
 
 # Qt
-IF(NOT SALOME_BUILD_WITH_QT5)
-  FIND_PACKAGE(SalomeQt4 REQUIRED COMPONENTS QtCore QtGui QtXml QtWebKit QtOpenGL QtNetwork)
-  ADD_DEFINITIONS("-DUSE_SALOME_STYLE")
-  SET(QT_SALOME_VERSION 4)
-  SET(SALOME_GUI_ENABLE_QTXWEBBROWSER TRUE)
-ELSE()
-  FIND_PACKAGE(SalomeQt5 REQUIRED)
-  SET(QT_SALOME_VERSION 5)
-  SET(SALOME_GUI_ENABLE_QTXWEBBROWSER TRUE)
-  IF(NOT "${QT_VERSION}" VERSION_LESS "5.6.0")
-    # Check that WebEngineWidgets component was found
-    IF(NOT Qt5WebEngineWidgets_FOUND)
-      SET(SALOME_GUI_ENABLE_QTXWEBBROWSER FALSE)
-      ADD_DEFINITIONS("-DDISABLE_QTXWEBBROWSER")
-      MESSAGE("Qt5WebEngineWidgets is not found, SALOME internal help browser will be unavailable !")
-    ENDIF()
+FIND_PACKAGE(SalomeQt5 REQUIRED)
+SET(QT_SALOME_VERSION 5)
+SET(SALOME_GUI_ENABLE_QTXWEBBROWSER TRUE)
+IF(NOT "${QT_VERSION}" VERSION_LESS "5.6.0")
+  # Check that WebEngineWidgets component was found
+  IF(NOT Qt5WebEngineWidgets_FOUND)
+    SET(SALOME_GUI_ENABLE_QTXWEBBROWSER FALSE)
+    ADD_DEFINITIONS("-DDISABLE_QTXWEBBROWSER")
+    MESSAGE("Qt5WebEngineWidgets is not found, SALOME internal help browser will be unavailable !")
   ENDIF()
 ENDIF()
 
 # PyQt
-IF (NOT SALOME_BUILD_WITH_QT5)
-  FIND_PACKAGE(SalomePyQt4 REQUIRED)
-ELSE()
-  FIND_PACKAGE(SalomePyQt5 REQUIRED)
-ENDIF()
+FIND_PACKAGE(SalomePyQt5 REQUIRED)
 
 # Optional packages for GUI and their pre-requisites
 
@@ -439,13 +427,9 @@ EXPORT(TARGETS ${_${PROJECT_NAME}_exposed_targets}
 # Ensure the variables are always defined for the configure:
 SET(KERNEL_ROOT_DIR "${KERNEL_ROOT_DIR}")
 SET(SIP_ROOT_DIR "${SIP_ROOT_DIR}")
-IF(NOT SALOME_BUILD_WITH_QT5)
-  SET(QT_ROOT_DIR "${QT4_ROOT_DIR}")
-  SET(PYQT_ROOT_DIR "${PYQT4_ROOT_DIR}")
-ELSE()
-  SET(QT_ROOT_DIR "${QT5_ROOT_DIR}")
-  SET(PYQT_ROOT_DIR "${PYQT5_ROOT_DIR}")
-ENDIF()
+SET(QT_ROOT_DIR "${QT5_ROOT_DIR}")
+SET(PYQT_ROOT_DIR "${PYQT5_ROOT_DIR}")
+
 SET(OPENCASCADE_ROOT_DIR "${OPENCASCADE_ROOT_DIR}")
 SET(OPENGL_ROOT_DIR "${OPENGL_ROOT_DIR}")
 SET(VTK_ROOT_DIR "${VTK_ROOT_DIR}")
@@ -454,11 +438,7 @@ SET(QWT_ROOT_DIR "${QWT_ROOT_DIR}")
 SET(CONF_INCLUDE_DIRS "${PROJECT_SOURCE_DIR}/include" "${PROJECT_BINARY_DIR}/include")
 
 # Build variables that will be expanded when configuring Salome<MODULE>Config.cmake:
-IF(NOT SALOME_BUILD_WITH_QT5)
-  SALOME_CONFIGURE_PREPARE(OpenCASCADE OpenGL Qt4 PyQt4 Qwt SIP VTK)
-ELSE()
-  SALOME_CONFIGURE_PREPARE(OpenCASCADE OpenGL Qt5 PyQt5 Qwt SIP VTK)
-ENDIF()
+SALOME_CONFIGURE_PREPARE(OpenCASCADE OpenGL Qt5 PyQt5 Qwt SIP VTK)
 
 CONFIGURE_PACKAGE_CONFIG_FILE(${PROJECT_NAME}Config.cmake.in 
     ${PROJECT_BINARY_DIR}/${PROJECT_NAME}Config.cmake
diff --git a/SalomeGUIConfig.cmake.in b/SalomeGUIConfig.cmake.in
index a47667865..08492ef2f 100644
--- a/SalomeGUIConfig.cmake.in
+++ b/SalomeGUIConfig.cmake.in
@@ -50,7 +50,6 @@ SET(GUI_DEFINITIONS "@KERNEL_DEFINITIONS@")
 SET(SALOME_GUI_BUILD_DOC      @SALOME_BUILD_DOC@)
 SET(SALOME_GUI_BUILD_TESTS    @SALOME_BUILD_TESTS@)
 SET(SALOME_GUI_LIGHT_ONLY     @SALOME_LIGHT_ONLY@)
-SET(SALOME_GUI_BUILD_WITH_QT5 @SALOME_BUILD_WITH_QT5@)
 
 # Advanced options
 SET(SALOME_USE_OCCVIEWER      @SALOME_USE_OCCVIEWER@)
@@ -111,13 +110,8 @@ ENDIF()
 # Level 1 prerequisites:
 SET_AND_CHECK(KERNEL_ROOT_DIR_EXP "@PACKAGE_KERNEL_ROOT_DIR@")
 SET_AND_CHECK(SIP_ROOT_DIR_EXP "@PACKAGE_SIP_ROOT_DIR@")
-IF(NOT SALOME_GUI_BUILD_WITH_QT5)
-  SET_AND_CHECK(QT4_ROOT_DIR_EXP "@PACKAGE_QT_ROOT_DIR@")
-  SET_AND_CHECK(PYQT4_ROOT_DIR_EXP "@PACKAGE_PYQT_ROOT_DIR@")
-ELSE()
-  SET_AND_CHECK(QT5_ROOT_DIR_EXP "@PACKAGE_QT_ROOT_DIR@")
-  SET_AND_CHECK(PYQT5_ROOT_DIR_EXP "@PACKAGE_PYQT_ROOT_DIR@")
-ENDIF()
+SET_AND_CHECK(QT5_ROOT_DIR_EXP "@PACKAGE_QT_ROOT_DIR@")
+SET_AND_CHECK(PYQT5_ROOT_DIR_EXP "@PACKAGE_PYQT_ROOT_DIR@")
 SET_AND_CHECK(OPENCASCADE_ROOT_DIR_EXP "@PACKAGE_OPENCASCADE_ROOT_DIR@")
 
 # Optional level 1 prerequisites:
diff --git a/src/GLViewer/GLViewer_Drawer.cxx b/src/GLViewer/GLViewer_Drawer.cxx
index 329b0a666..235157558 100644
--- a/src/GLViewer/GLViewer_Drawer.cxx
+++ b/src/GLViewer/GLViewer_Drawer.cxx
@@ -400,9 +400,6 @@ static GLuint displayListBase( QFont* theFont )
     listBase += 256;
 
     HDC glHdc = ::wglGetCurrentDC();
- #if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    ::SelectObject( glHdc, theFont->handle() );
- #endif
     if ( !::wglUseFontBitmaps( glHdc, 0, 256, listBase ) )
       listBase = 0;
     aList = listBase;
@@ -474,33 +471,24 @@ static GLuint displayListBase( QFont* theFont )
     QString aFontDef = theFont->toString();
     char** xFontList = XListFonts( aDisp, aFontDef.toLatin1()/*aFindFont.myFontString.data()*/, 1, &aFontCont  );
 // TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    if( !theFont->handle() )
-    {
-#endif
 #ifdef _DEBUG_
-      printf( "Can't load font %s. loading default font....\n", aFontDef.toLatin1().data()/*aFindFont.myFontString.data()*/ );
+    printf( "Can't load font %s. loading default font....\n", aFontDef.toLatin1().data()/*aFindFont.myFontString.data()*/ );
 #endif
-      QString aFontMask ("-*-*-*-r-*-*-");
-      aFontMask += aFontDef/*aFindFont.myFontString*/.section( ',', 1, 1 );
+    QString aFontMask ("-*-*-*-r-*-*-");
+    aFontMask += aFontDef/*aFindFont.myFontString*/.section( ',', 1, 1 );
 #ifdef _DEBUG_
-      printf( "Height of Default font: %s\n", aFontDef/*aFindFont.myFontString*/.section( ',', 1, 1 ).data() );
+    printf( "Height of Default font: %s\n", aFontDef/*aFindFont.myFontString*/.section( ',', 1, 1 ).data() );
 #endif
-      aFontMask += "-*-*-*-m-*-*-*";
-      xFontList = XListFonts( aDisp, aFontMask.toLatin1().constData()/*"-*-*-*-r-*-*-12-*-*-*-m-*-*-*"*/, 1, &aFontCont  );
-      if( aFontCont == 0 )
-      {
+    aFontMask += "-*-*-*-m-*-*-*";
+    xFontList = XListFonts( aDisp, aFontMask.toLatin1().constData()/*"-*-*-*-r-*-*-12-*-*-*-m-*-*-*"*/, 1, &aFontCont  );
+    if( aFontCont == 0 )
+    {
 #ifdef _DEBUG_
-        printf( "Can't load default font\n" );
+      printf( "Can't load default font\n" );
 #endif
-        return 0;
-      }
-      glXUseXFont( (Font)(XLoadFont( aDisp,xFontList[0] )), 0, 256, listBase );
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
+      return 0;
     }
-    else
-      glXUseXFont( (Font)(theFont->handle()), 0, 256, listBase );
-#endif
+    glXUseXFont( (Font)(XLoadFont( aDisp,xFontList[0] )), 0, 256, listBase );
     aList = listBase;
     GLViewer_TexFont::BitmapFontCache[aFindFont] = aList;
   }
diff --git a/src/GLViewer/GLViewer_ViewPort.cxx b/src/GLViewer/GLViewer_ViewPort.cxx
index 562924765..4f1ca1fdc 100644
--- a/src/GLViewer/GLViewer_ViewPort.cxx
+++ b/src/GLViewer/GLViewer_ViewPort.cxx
@@ -121,16 +121,6 @@ static Colormap choose_cmap( Display *dpy, XVisualInfo *vi )
 #ifdef DEBUG
     cout << "Choosing cmap for vID = " << vi->visualid << endl;
 #endif
-
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    if ( vi->visualid == XVisualIDFromVisual( (Visual*)QX11Info::appVisual() ) )
-    {
-#ifdef DEBUG
-        cout << "Using x11AppColormap" << endl;
-#endif
-        return QX11Info::appColormap();
-    }
-#else
     if ( vi->visualid == XVisualIDFromVisual( XDefaultVisual( QX11Info::display(), -1 ) ) )
     {
 #ifdef DEBUG
@@ -138,7 +128,6 @@ static Colormap choose_cmap( Display *dpy, XVisualInfo *vi )
 #endif
         return XDefaultColormap( QX11Info::display(), -1 );
     }
-#endif
     if ( mesa_gl )
     {
         Atom hp_cmaps = XInternAtom( dpy, "_HP_RGB_SMOOTH_MAP_LIST", true );
diff --git a/src/GLViewer/GLViewer_Viewer.cxx b/src/GLViewer/GLViewer_Viewer.cxx
index 1bb4b8751..dab34eb0e 100644
--- a/src/GLViewer/GLViewer_Viewer.cxx
+++ b/src/GLViewer/GLViewer_Viewer.cxx
@@ -888,9 +888,6 @@ void GLViewer_ViewSketcher::onSketch( SketchState state )
 
     if ( state == Fin )
     {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    	QApplication::syncX();  /* force rectangle redrawing */
-#endif
         myViewer->activateSketching( GLViewer_Viewer::NoSketching );
     }
 }
diff --git a/src/GraphicsView/GraphicsView_ViewPort.cxx b/src/GraphicsView/GraphicsView_ViewPort.cxx
index fb156593c..4607f6906 100644
--- a/src/GraphicsView/GraphicsView_ViewPort.cxx
+++ b/src/GraphicsView/GraphicsView_ViewPort.cxx
@@ -480,11 +480,7 @@ bool GraphicsView_ViewPort::dumpViewToFormat(const QString& fileName, const QStr
     return false;
 
   QPrinter printer(QPrinter::ScreenResolution);
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  printer.setOutputFormat(QPrinter::PostScriptFormat);
-#else
   printer.setOutputFormat(QPrinter::PdfFormat);
-#endif
   printer.setOutputFileName(fileName);
   QPainter painter;  
   if (!painter.begin(&printer))
diff --git a/src/HelpBrowser/qtlocalpeer.cpp b/src/HelpBrowser/qtlocalpeer.cpp
index 19914f458..b96dc676f 100644
--- a/src/HelpBrowser/qtlocalpeer.cpp
+++ b/src/HelpBrowser/qtlocalpeer.cpp
@@ -119,13 +119,6 @@ bool QtLocalPeer::isClient()
         return true;
 
     bool res = server->listen(socketName);
-#if defined(Q_OS_UNIX) && (QT_VERSION >= QT_VERSION_CHECK(4,5,0))
-    // ### Workaround
-    if (!res && server->serverError() == QAbstractSocket::AddressInUseError) {
-        QFile::remove(QDir::cleanPath(QDir::tempPath())+QLatin1Char('/')+socketName);
-        res = server->listen(socketName);
-    }
-#endif
     if (!res)
         qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
     QObject::connect(server, SIGNAL(newConnection()), SLOT(receiveConnection()));
diff --git a/src/HelpBrowser/qtlockedfile_win.cpp b/src/HelpBrowser/qtlockedfile_win.cpp
index a86bf3d51..1d11492b2 100644
--- a/src/HelpBrowser/qtlockedfile_win.cpp
+++ b/src/HelpBrowser/qtlockedfile_win.cpp
@@ -46,9 +46,7 @@
 // Maximum number of concurrent read locks. Must not be greater than MAXIMUM_WAIT_OBJECTS
 #define MAX_READERS MAXIMUM_WAIT_OBJECTS
 
-#if QT_VERSION >= 0x050000
 #define QT_WA(unicode, ansi) unicode
-#endif
 
 Qt::HANDLE QtLockedFile::getMutexHandle(int idx, bool doCreate)
 {
diff --git a/src/HelpBrowser/qtsingleapplication.cpp b/src/HelpBrowser/qtsingleapplication.cpp
index d0fb15d76..86adc1129 100644
--- a/src/HelpBrowser/qtsingleapplication.cpp
+++ b/src/HelpBrowser/qtsingleapplication.cpp
@@ -170,62 +170,6 @@ QtSingleApplication::QtSingleApplication(const QString &appId, int &argc, char *
     sysInit(appId);
 }
 
-#if QT_VERSION < 0x050000
-
-/*!
-    Creates a QtSingleApplication object. The application identifier
-    will be QCoreApplication::applicationFilePath(). \a argc, \a
-    argv, and \a type are passed on to the QAppliation constructor.
-*/
-QtSingleApplication::QtSingleApplication(int &argc, char **argv, Type type)
-    : QApplication(argc, argv, type)
-{
-    sysInit();
-}
-
-
-#  if defined(Q_WS_X11)
-/*!
-  Special constructor for X11, ref. the documentation of
-  QApplication's corresponding constructor. The application identifier
-  will be QCoreApplication::applicationFilePath(). \a dpy, \a visual,
-  and \a cmap are passed on to the QApplication constructor.
-*/
-QtSingleApplication::QtSingleApplication(Display* dpy, Qt::HANDLE visual, Qt::HANDLE cmap)
-    : QApplication(dpy, visual, cmap)
-{
-    sysInit();
-}
-
-/*!
-  Special constructor for X11, ref. the documentation of
-  QApplication's corresponding constructor. The application identifier
-  will be QCoreApplication::applicationFilePath(). \a dpy, \a argc, \a
-  argv, \a visual, and \a cmap are passed on to the QApplication
-  constructor.
-*/
-QtSingleApplication::QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
-    : QApplication(dpy, argc, argv, visual, cmap)
-{
-    sysInit();
-}
-
-/*!
-  Special constructor for X11, ref. the documentation of
-  QApplication's corresponding constructor. The application identifier
-  will be \a appId. \a dpy, \a argc, \a
-  argv, \a visual, and \a cmap are passed on to the QApplication
-  constructor.
-*/
-QtSingleApplication::QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual, Qt::HANDLE cmap)
-    : QApplication(dpy, argc, argv, visual, cmap)
-{
-    sysInit(appId);
-}
-#  endif // Q_WS_X11
-#endif // QT_VERSION < 0x050000
-
-
 /*!
     Returns true if another instance of this application is running;
     otherwise false.
diff --git a/src/HelpBrowser/qtsingleapplication.h b/src/HelpBrowser/qtsingleapplication.h
index 049406f72..cb2bfaf73 100644
--- a/src/HelpBrowser/qtsingleapplication.h
+++ b/src/HelpBrowser/qtsingleapplication.h
@@ -68,14 +68,11 @@ class QT_QTSINGLEAPPLICATION_EXPORT QtSingleApplication : public QApplication
 public:
     QtSingleApplication(int &argc, char **argv, bool GUIenabled = true);
     QtSingleApplication(const QString &id, int &argc, char **argv);
-#if QT_VERSION < 0x050000
-    QtSingleApplication(int &argc, char **argv, Type type);
 #  if defined(Q_WS_X11)
     QtSingleApplication(Display* dpy, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
     QtSingleApplication(Display *dpy, int &argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE cmap= 0);
     QtSingleApplication(Display* dpy, const QString &appId, int argc, char **argv, Qt::HANDLE visual = 0, Qt::HANDLE colormap = 0);
 #  endif // Q_WS_X11
-#endif // QT_VERSION < 0x050000
 
     bool isRunning();
     QString id() const;
diff --git a/src/LightApp/LightApp_Application.cxx b/src/LightApp/LightApp_Application.cxx
index de5d7a161..83909627c 100644
--- a/src/LightApp/LightApp_Application.cxx
+++ b/src/LightApp/LightApp_Application.cxx
@@ -2104,11 +2104,7 @@ QWidget* LightApp_Application::createWindow( const int flag )
 
     // Create OBSelector
     new LightApp_OBSelector( ob, mySelMgr );
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    ob->treeView()->header()->setResizeMode(SUIT_DataObject::VisibilityId, QHeaderView::Fixed);
-#else
     ob->treeView()->header()->setSectionResizeMode(SUIT_DataObject::VisibilityId, QHeaderView::Fixed);
-#endif
     ob->treeView()->header()->moveSection(SUIT_DataObject::NameId,SUIT_DataObject::VisibilityId);
     ob->treeView()->setColumnWidth(SUIT_DataObject::VisibilityId, VISIBILITY_COLUMN_WIDTH);
     ob->setProperty( "shortcut", QKeySequence( "Alt+Shift+O" ) );
diff --git a/src/OCCViewer/OCCViewer_ViewPort.cxx b/src/OCCViewer/OCCViewer_ViewPort.cxx
index 39cb380cb..1e5584566 100644
--- a/src/OCCViewer/OCCViewer_ViewPort.cxx
+++ b/src/OCCViewer/OCCViewer_ViewPort.cxx
@@ -115,15 +115,6 @@ static Colormap choose_cmap( Display *dpy, XVisualInfo *vi )
   //cout << "Choosing cmap for vID = " << vi->visualid << endl;
   //#endif
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  if ( vi->visualid == XVisualIDFromVisual( (Visual*)QX11Info::appVisual() ) )
-  {
-#ifdef DEBUG
-//    cout << "Using x11AppColormap" << endl;
-#endif
-    return QX11Info::appColormap();
-  }
-#else
   if ( vi->visualid == XVisualIDFromVisual( XDefaultVisual( QX11Info::display(), -1 ) ) )
   {
 #ifdef DEBUG
@@ -131,7 +122,7 @@ static Colormap choose_cmap( Display *dpy, XVisualInfo *vi )
 #endif
     return XDefaultColormap( QX11Info::display(), -1 );
   }
-#endif
+
   if ( mesa_gl )
   {
     Atom hp_cmaps = XInternAtom( dpy, "_HP_RGB_SMOOTH_MAP_LIST", true );
diff --git a/src/OCCViewer/OCCViewer_ViewPort3d.cxx b/src/OCCViewer/OCCViewer_ViewPort3d.cxx
index e4e371634..3c1c3a8dd 100644
--- a/src/OCCViewer/OCCViewer_ViewPort3d.cxx
+++ b/src/OCCViewer/OCCViewer_ViewPort3d.cxx
@@ -547,9 +547,6 @@ void OCCViewer_ViewPort3d::paintEvent( QPaintEvent* e )
     mapView( activeView() );
 #endif
   if ( !myWindow.IsNull() ) {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    QApplication::syncX();
-#endif
     if ( !myPaintersRedrawing ) {
       activeView()->Redraw();
     }
@@ -563,13 +560,10 @@ void OCCViewer_ViewPort3d::paintEvent( QPaintEvent* e )
 */
 void OCCViewer_ViewPort3d::resizeEvent( QResizeEvent* e )
 {
-#if defined WIN32 || QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
+#if defined WIN32
   /* Win32 : map before first show to avoid flicker */
   if ( !mapped( activeView() ) )
     mapView( activeView() );
-#endif
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    QApplication::syncX();
 #endif
   QTimer::singleShot( 0, this, SLOT( repaintViewAfterMove() ) );
   emit vpResizeEvent( e );
diff --git a/src/OCCViewer/OCCViewer_ViewSketcher.cxx b/src/OCCViewer/OCCViewer_ViewSketcher.cxx
index add2206f1..e70aa8c2b 100644
--- a/src/OCCViewer/OCCViewer_ViewSketcher.cxx
+++ b/src/OCCViewer/OCCViewer_ViewSketcher.cxx
@@ -298,9 +298,6 @@ void OCCViewer_RectSketcher::onSketch( SketchState state )
 
   if ( state == Fin )
   {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    QApplication::syncX();  /* force rectangle redrawing */
-#endif
     mypViewWindow->activateSketching( OCCViewer_ViewWindow::NoSketching );
   }
 }
@@ -496,9 +493,6 @@ void OCCViewer_PolygonSketcher::onSketch( SketchState state )
     if ( state == Fin ) {
       mypPolyRB->clearGeometry();
       mypPolyRB->hide();
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-      QApplication::syncX();
-#endif
       mypViewWindow->activateSketching( OCCViewer_ViewWindow::NoSketching );
     } else {
       mypPolyRB->setUpdatesEnabled ( false );
diff --git a/src/Plot2d/Plot2d_ViewWindow.cxx b/src/Plot2d/Plot2d_ViewWindow.cxx
index b2ca7284b..861ab1e5c 100644
--- a/src/Plot2d/Plot2d_ViewWindow.cxx
+++ b/src/Plot2d/Plot2d_ViewWindow.cxx
@@ -787,16 +787,6 @@ void Plot2d_ViewWindow::onPrintView()
   if ( !myViewFrame )
     return;
 
-#if !defined(WIN32) && !defined(QT_NO_CUPS)
-#if QT_VERSION < 0x040303
-  if ( !Qtx::hasAnyPrinters() ) {
-    SUIT_MessageBox::warning( this, tr( "WRN_WARNING" ),
-                              tr( "WRN_NO_PRINTERS" ) );
-    return;
-  }
-#endif
-#endif
-
   // stored settings for further starts
   static QString aPrinterName;
   static int aColorMode = -1;
diff --git a/src/Qtx/Qtx.cxx b/src/Qtx/Qtx.cxx
index 30fda906e..b2dc37dac 100644
--- a/src/Qtx/Qtx.cxx
+++ b/src/Qtx/Qtx.cxx
@@ -38,9 +38,7 @@
 #include <QApplication>
 #include <QDesktopWidget>
 #include <QtDebug>
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
 #include <QSurfaceFormat>
-#endif
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -2108,7 +2106,6 @@ long Qtx::versionToId( const QString& version )
   
   The function tries to detect qt installation directory by analyzing the system variables in the following order:
   - QT5_ROOT_DIR
-  - QT4_ROOT_DIR
   - QT_ROOT_DIR
   - QTDIR
 
@@ -2121,7 +2118,7 @@ long Qtx::versionToId( const QString& version )
 QString Qtx::qtDir( const QString& context )
 {
 
-  QStringList vars = { "QT5_ROOT_DIR", "QT4_ROOT_DIR", "QT_ROOT_DIR", "QTDIR" };
+  QStringList vars = { "QT5_ROOT_DIR", "QT_ROOT_DIR", "QTDIR" };
   QString qtPath;
   for (uint i = 0; i < vars.length() && qtPath.isEmpty(); i++ ) {
     qtPath = getenv(vars[i]);
@@ -2242,8 +2239,6 @@ Qt::HANDLE Qtx::getVisual()
 
 #endif // WIN32
 
-
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
 /*!
   \brief Set default QSurfaceFormat for an application.
 
@@ -2279,7 +2274,6 @@ void Qtx::initDefaultSurfaceFormat()
 
   QSurfaceFormat::setDefaultFormat(fmt);
 }
-#endif
 
 /*!
   \class Qtx::CmdLineArgs
diff --git a/src/Qtx/Qtx.h b/src/Qtx/Qtx.h
index 25d4010c8..042ca830b 100644
--- a/src/Qtx/Qtx.h
+++ b/src/Qtx/Qtx.h
@@ -285,10 +285,7 @@ public:
   static void*       getDisplay();
   static Qt::HANDLE  getVisual();
 #endif
-
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
   static void initDefaultSurfaceFormat();
-#endif
 };
 
 #endif
diff --git a/src/Qtx/QtxDialog.cxx b/src/Qtx/QtxDialog.cxx
index bcc038ad7..dae191431 100644
--- a/src/Qtx/QtxDialog.cxx
+++ b/src/Qtx/QtxDialog.cxx
@@ -1442,9 +1442,6 @@ void QtxDialog::reject()
 void QtxDialog::emitSignal()
 {
   QApplication::instance()->processEvents();
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  QApplication::syncX();
-#endif
   int id = buttonId( (QAbstractButton*)mySender );
   mySender = 0;
 
diff --git a/src/Qtx/QtxPopupMgr.cxx b/src/Qtx/QtxPopupMgr.cxx
index e71b1bdcc..eae7e4aac 100644
--- a/src/Qtx/QtxPopupMgr.cxx
+++ b/src/Qtx/QtxPopupMgr.cxx
@@ -30,49 +30,6 @@
 #include <QMenu>
 #include <QVariant>
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
- 
-/*!
-  \brief Used for comparing of two QVariant values.
-  \param v1 first argument for comparison
-  \param v2 second argument for comparison
-  \return \c true if \a v1 less than \a v2
-*/
-bool operator<( const QVariant& v1, const QVariant& v2 )
-{
-  QVariant::Type t1 = v1.type(), t2 = v2.type();
-  if ( t1 == t2 )
-  {
-    switch( t1 )
-    {
-    case QVariant::Int:
-      return v1.toInt() < v2.toInt();
-    case QVariant::Double:
-      return v1.toDouble() < v2.toDouble();
-    case QVariant::String:
-      return v1.toString() < v2.toString();
-    case QVariant::StringList:
-    case QVariant::List:
-    {
-      const QList<QVariant>& aList1 = v1.toList(), aList2 = v2.toList();
-      QList<QVariant>::const_iterator anIt1 = aList1.begin(), aLast1 = aList1.end(),
-        anIt2 = aList2.begin(), aLast2 = aList2.end();
-      for ( ; anIt1 != aLast1 && anIt2 != aLast2;  anIt1++, anIt2++ )
-      {
-        if ( (*anIt1) != (*anIt2) )
-          return (*anIt1) < (*anIt2);
-      }
-      return anIt1 == aLast1 && anIt2 != aLast2;
-    }
-    default:
-      return v1.toString() < v2.toString();
-    }
-  }
-  return t1 < t2;
-}
-
-#else
-
 bool operator<( const QList<QVariant>& v1, const QList<QVariant>& v2 )
 {
   QList<QVariant>::const_iterator anIt1 = v1.begin(), aLast1 = v1.end(),
@@ -85,8 +42,6 @@ bool operator<( const QList<QVariant>& v1, const QList<QVariant>& v2 )
   return anIt1 == aLast1 && anIt2 != aLast2;
 }
 
-#endif // QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-
 /*!
   \class QtxPopupMgr::PopupCreator
   \internal
diff --git a/src/Qtx/QtxTranslator.cxx b/src/Qtx/QtxTranslator.cxx
index 4c36d1a6f..38a83cbd8 100644
--- a/src/Qtx/QtxTranslator.cxx
+++ b/src/Qtx/QtxTranslator.cxx
@@ -63,25 +63,6 @@ QtxTranslator::~QtxTranslator()
 {
 }
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-
-/*!
-  \brief Returns the translation for the key.
-  \param context message context
-  \param sourceText message source name
-  \param disambiguation message comment (optional)
-  \return Translated text if found or \a sourceText otherwise
-*/
-QString QtxTranslator::translate( const char* context, const char* sourceText, const char* disambiguation ) const
-{
-  QString res = QTranslator::translate( context, sourceText, disambiguation );
-  if ( res.isNull() )
-    res = QTranslator::translate( GLOBAL_CONTEXT, sourceText, disambiguation );
-  return res;
-}
-
-#else
-
 /*!
   \brief Returns the translation for the key.
   \param context message context
@@ -98,4 +79,3 @@ QString QtxTranslator::translate( const char* context, const char* sourceText, c
   return res;
 }
 
-#endif // QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
diff --git a/src/Qtx/QtxTranslator.h b/src/Qtx/QtxTranslator.h
index 2a47e3df1..1ecdff538 100644
--- a/src/Qtx/QtxTranslator.h
+++ b/src/Qtx/QtxTranslator.h
@@ -32,11 +32,7 @@ class QTX_EXPORT QtxTranslator : public QTranslator
 public:
   QtxTranslator( QObject* parent = 0 );
   ~QtxTranslator();
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  virtual QString translate( const char*, const char*, const char* = 0 ) const;
-#else
   virtual QString translate( const char*, const char*, const char* = 0, int = -1 ) const;
-#endif
 };
 
 #endif
diff --git a/src/Qtx/QtxTreeView.cxx b/src/Qtx/QtxTreeView.cxx
index a485e6d23..1147f4349 100644
--- a/src/Qtx/QtxTreeView.cxx
+++ b/src/Qtx/QtxTreeView.cxx
@@ -107,17 +107,10 @@ void QtxTreeView::Header::contextMenuEvent( QContextMenuEvent* e )
     QVariant appropriate = model()->headerData( i, orientation(), Qtx::AppropriateRole );
     QIcon icon;
     if ( iconData.isValid() ) {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-      if ( iconData.canConvert( QVariant::Icon ) )
-        icon = iconData.value<QIcon>();
-      else if ( iconData.canConvert( QVariant::Pixmap ) )
-        icon = iconData.value<QPixmap>();
-#else
       if ( iconData.canConvert( QMetaType::QIcon ) )
         icon = iconData.value<QIcon>();
       else if ( iconData.canConvert( QMetaType::QPixmap ) )
         icon = iconData.value<QPixmap>();
-#endif
     }
     if( ( !lab.isEmpty() || !icon.isNull() ) && 
             appropriate.isValid() ? appropriate.toInt()==Qtx::Toggled : true )
@@ -143,11 +136,7 @@ void QtxTreeView::Header::contextMenuEvent( QContextMenuEvent* e )
     }
     else if ( a && a == sortAction ) {
       setSortIndicatorShown( a->isChecked() );
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-      setClickable( a->isChecked() );
-#else
       setSectionsClickable( a->isChecked() );
-#endif
       QtxTreeView* view = qobject_cast<QtxTreeView*>( parent() );
       if ( view ) {
         view->emitSortingEnabled( a->isChecked() );
@@ -192,11 +181,7 @@ QtxTreeView::QtxTreeView( QWidget* parent )
 : QTreeView( parent )
 {
   setHeader( new Header( false, this ) );
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  header()->setMovable( true );
-#else
   header()->setSectionsMovable( true );
-#endif
 }
 
 /*!
@@ -208,11 +193,7 @@ QtxTreeView::QtxTreeView( const bool enableSortMenu, QWidget* parent )
 : QTreeView( parent )
 {
   setHeader( new Header( enableSortMenu, this ) );
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  header()->setMovable( true );
-#else
   header()->setSectionsMovable( true );
-#endif
 }
 
 /*!
diff --git a/src/SUIT/SUIT_FileDlg.cxx b/src/SUIT/SUIT_FileDlg.cxx
index f8127f9b8..749c89879 100644
--- a/src/SUIT/SUIT_FileDlg.cxx
+++ b/src/SUIT/SUIT_FileDlg.cxx
@@ -131,13 +131,9 @@ SUIT_FileDlg::SUIT_FileDlg( QWidget* parent, bool open, bool showQuickDir, bool
     setWindowIcon( parent->windowIcon() );
 
   // GDD
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  myUrls.insert(0,QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::ApplicationsLocation)));
-  myUrls.insert(0,QUrl::fromLocalFile(QDesktopServices::storageLocation(QDesktopServices::HomeLocation)));
-#else
   myUrls.insert(0,QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::ApplicationsLocation)));
   myUrls.insert(0,QUrl::fromLocalFile(QStandardPaths::writableLocation(QStandardPaths::HomeLocation)));
-#endif
+
   setSidebarUrls(myUrls);
 
   // add quick directories widgets
diff --git a/src/SUIT/SUIT_TreeModel.cxx b/src/SUIT/SUIT_TreeModel.cxx
index 3b1f804ab..8feae8ad9 100644
--- a/src/SUIT/SUIT_TreeModel.cxx
+++ b/src/SUIT/SUIT_TreeModel.cxx
@@ -500,9 +500,7 @@ SUIT_TreeModel::~SUIT_TreeModel()
 void SUIT_TreeModel::registerColumn( const int group_id, const QString& name, const int custom_id )
 {
   bool found = false;
-#if QT_VERSION >= QT_VERSION_CHECK(4, 6, 0)
   beginResetModel();
-#endif
   for ( int i=0, n=myColumns.size(); i<n && !found; i++ ) {
     if ( name == myColumns[i].myName ) {
       myColumns[i].myIds.insert( group_id, custom_id );
@@ -518,11 +516,7 @@ void SUIT_TreeModel::registerColumn( const int group_id, const QString& name, co
     int n = myColumns.size();
     myColumns.resize( n+1 );
     myColumns[n] = inf;
-#if QT_VERSION >= QT_VERSION_CHECK(4, 6, 0)
     endResetModel();
-#else
-    reset();
-#endif
   }
 }
 
@@ -540,18 +534,12 @@ void SUIT_TreeModel::registerColumn( const int group_id, const QString& name, co
 void SUIT_TreeModel::unregisterColumn( const int group_id, const QString& name )
 {
   for ( int i = 0, n = myColumns.size(); i < n; i++ ) {
-#if QT_VERSION >= QT_VERSION_CHECK(4, 6, 0)
     beginResetModel();
-#endif
     if ( myColumns[i].myName == name ) {
       myColumns[i].myIds.remove( group_id );
       if ( myColumns[i].myIds.isEmpty() ) {
         myColumns.remove( i );
-#if QT_VERSION >= QT_VERSION_CHECK(4, 6, 0)
         endResetModel();
-#else
-        reset();
-#endif
       }
       break;
     }
@@ -760,10 +748,7 @@ void SUIT_TreeModel::setRoot( SUIT_DataObject* r )
 {
   if ( root() == r )
     return;
-
-#if QT_VERSION >= QT_VERSION_CHECK(4, 6, 0)
   beginResetModel();
-#endif
 
   if ( autoDeleteTree() ) {
     SUIT_DataObject::disconnect( SIGNAL( inserted( SUIT_DataObject*, SUIT_DataObject* ) ),
@@ -784,11 +769,7 @@ void SUIT_TreeModel::setRoot( SUIT_DataObject* r )
   myRoot = r;
 
   //initialize();
-#if QT_VERSION >= QT_VERSION_CHECK(4, 6, 0)
   endResetModel();
-#else
-  reset();
-#endif
   emit modelUpdated();
 }
 
@@ -2318,8 +2299,6 @@ void SUIT_ItemDelegate::paint( QPainter* painter,
 QSize SUIT_ItemDelegate::sizeHint ( const QStyleOptionViewItem & option, const QModelIndex & index ) const
 {
     QSize size = QItemDelegate::sizeHint ( option, index );
-#if QT_VERSION >= 0x040500
     size.setHeight( size.height() + 1 );
-#endif
     return size;
 }
diff --git a/src/SUITApp/SUITApp.cxx b/src/SUITApp/SUITApp.cxx
index c3b31f35d..cc8c3cfb6 100644
--- a/src/SUITApp/SUITApp.cxx
+++ b/src/SUITApp/SUITApp.cxx
@@ -179,28 +179,17 @@ int main( int argc, char* argv[] )
     }
   }
 
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
+
   // RNV: setup the default format:
   // QSurfaceFormat should be set before creation of QApplication,  
   // so to avoid conflicts beetween SALOME and ParaView QSurfaceFormats we should merge theirs formats
   // (see void Qtx::initDefaultSurfaceFormat()) and set the resultant format here.
   Qtx::initDefaultSurfaceFormat();
-#endif
 
   // add <qtdir>/plugins directory to the pluins search path for image plugins
   QString qtdir = Qtx::qtDir( "plugins" );
   if ( !qtdir.isEmpty() )
     QApplication::addLibraryPath( qtdir );
-
-// TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  //Set a "native" graphic system in case if application runs on the remote host
-  QString remote(::getenv("REMOTEHOST"));
-  QString client(::getenv("SSH_CLIENT"));
-  if(remote.length() > 0 || client.length() > 0 ) {
-    QApplication::setGraphicsSystem(QLatin1String("native"));
-  }
-#endif
   
   SUITApp_Application app( argc, argv );
   QString cfgAppName = getAppName( argList.isEmpty() ? QString() : argList.first() );
diff --git a/src/SUITApp/SUITApp_Application.cxx b/src/SUITApp/SUITApp_Application.cxx
index 6e89be1fe..2816250ea 100644
--- a/src/SUITApp/SUITApp_Application.cxx
+++ b/src/SUITApp/SUITApp_Application.cxx
@@ -40,29 +40,11 @@
   Constructor
 */
 SUITApp_Application::SUITApp_Application( int& argc, char** argv, SUIT_ExceptionHandler* hand )
-// TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if !defined(WIN32) && !defined(__APPLE__) && (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-  // san: Opening an X display and choosing a visual most suitable for 3D visualization
-  // in order to make SALOME viewers work with non-native X servers
-  : QApplication( (Display*)Qtx::getDisplay(), argc, argv, Qtx::getVisual() ),
-#else
   : QApplication( argc, argv ), 
-#endif
 myExceptHandler( hand )
 {
 }
 
-/*!
-  Constructor
-*/
-// TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-SUITApp_Application::SUITApp_Application( int& argc, char** argv, Type type, SUIT_ExceptionHandler* hand )
-  : QApplication( argc, argv, type ),
-myExceptHandler( hand )
-{
-}
-#endif
 /*!
   Sends event to receiver
   \return the value that is returned from the receiver's event handler
diff --git a/src/SUITApp/SUITApp_Application.h b/src/SUITApp/SUITApp_Application.h
index 27b4221c3..c6d9b31c0 100644
--- a/src/SUITApp/SUITApp_Application.h
+++ b/src/SUITApp/SUITApp_Application.h
@@ -43,10 +43,6 @@ class SUITAPP_EXPORT SUITApp_Application : public QApplication
 
 public:
   SUITApp_Application( int&, char**, SUIT_ExceptionHandler* = 0 );
-// TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  SUITApp_Application( int&, char**, Type, SUIT_ExceptionHandler* = 0 );
-#endif
   virtual bool notify( QObject* receiver, QEvent* e );
 
   SUIT_ExceptionHandler* handler() const;
diff --git a/src/SVTK/SVTK_RenderWindowInteractor.cxx b/src/SVTK/SVTK_RenderWindowInteractor.cxx
index c8ac1e87d..e7026ded2 100644
--- a/src/SVTK/SVTK_RenderWindowInteractor.cxx
+++ b/src/SVTK/SVTK_RenderWindowInteractor.cxx
@@ -35,9 +35,7 @@
 // Put Qt includes before the X11 includes which #define the symbol None
 // (see SVTK_SpaceMouse.h) to avoid the compilation error.
 #if !defined(WIN32) && !defined(__APPLE__)
-#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)
 #include <xcb/xcb.h>
-#endif
 #include <QX11Info>
 #endif
 #include <QMouseEvent>
@@ -113,16 +111,10 @@ QVTK_RenderWindowInteractor
 ::~QVTK_RenderWindowInteractor() 
 {
 #if !defined WIN32 && !defined __APPLE__
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  SVTK_SpaceMouseX* aSpaceMouse = SVTK_SpaceMouseX::getInstance();
-  if ( aSpaceMouse && aSpaceMouse->isSpaceMouseOn() )
-    aSpaceMouse->close( QX11Info::display() );
-#else
   SVTK_SpaceMouseXCB* aSpaceMouse = SVTK_SpaceMouseXCB::getInstance();
   if ( aSpaceMouse && aSpaceMouse->isSpaceMouseOn() )
     aSpaceMouse->close( QX11Info::connection() );
 #endif
-#endif
 }
 
 
@@ -417,17 +409,6 @@ QVTK_RenderWindowInteractor
 
 #if !defined WIN32 && !defined __APPLE__
   // register set space mouse events receiver
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  SVTK_SpaceMouseX* aSpaceMouse = SVTK_SpaceMouseX::getInstance();
-  if ( aSpaceMouse )
-  {
-    if ( !aSpaceMouse->isSpaceMouseOn() )
-      // initialize 3D space mouse driver 
-      aSpaceMouse->initialize( QX11Info::display(), winId() );
-    else
-      aSpaceMouse->setWindow( QX11Info::display(), winId() );
-  }
-#else
   SVTK_SpaceMouseXCB* aSpaceMouse = SVTK_SpaceMouseXCB::getInstance();
   if ( aSpaceMouse )
   {
@@ -438,7 +419,6 @@ QVTK_RenderWindowInteractor
       aSpaceMouse->setWindow( QX11Info::connection(), winId() );
   }
 #endif
-#endif
 }
 
 /*!
@@ -452,69 +432,12 @@ QVTK_RenderWindowInteractor
   QWidget::focusOutEvent( event );
 
 #if !defined WIN32 && !defined __APPLE__
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  // unregister set space mouse events receiver
-  SVTK_SpaceMouseX* aSpaceMouse = SVTK_SpaceMouseX::getInstance();
-  if ( aSpaceMouse && aSpaceMouse->isSpaceMouseOn() )
-    aSpaceMouse->setWindow( QX11Info::display(), 0 );
-#else
   SVTK_SpaceMouseXCB* aSpaceMouse = SVTK_SpaceMouseXCB::getInstance();
   if ( aSpaceMouse && aSpaceMouse->isSpaceMouseOn() )
     aSpaceMouse->setWindow( QX11Info::connection(), 0 );
 #endif
-#endif
-}
-
-// TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-#if defined(WIN32)
-
-/*!
-  To handle native Win32 events (from such devices as SpaceMouse)
-*/
-bool QVTK_RenderWindowInteractor::winEvent( MSG* msg, long* result )
-{
-  // TODO: Implement event handling for SpaceMouse
-  return QWidget::winEvent( msg, result);
 }
 
-#elif !defined(__APPLE__)
-/*!
-  To handle native X11 events (from such devices as SpaceMouse)
-*/
-bool
-QVTK_RenderWindowInteractor
-::x11Event( XEvent *xEvent )
-{
-  // handle 3d space mouse events
-  if ( SVTK_SpaceMouseX* aSpaceMouse = SVTK_SpaceMouseX::getInstance() )
-  {
-    if ( aSpaceMouse->isSpaceMouseOn() && xEvent->type == ClientMessage )
-    {
-      SVTK_SpaceMouse::MoveEvent anEvent;
-      int type = aSpaceMouse->translateEvent( QX11Info::display(), xEvent, &anEvent, 1.0, 1.0 );
-      switch ( type )
-      {
-      case SVTK_SpaceMouse::SpaceMouseMove:
-              GetDevice()->InvokeEvent( SVTK::SpaceMouseMoveEvent, anEvent.data );
-              break;
-      case SVTK_SpaceMouse::SpaceButtonPress:
-              GetDevice()->InvokeEvent( SVTK::SpaceMouseButtonEvent, &anEvent.button );
-              break;
-      case SVTK_SpaceMouse::SpaceButtonRelease:
-              break;
-      }
-      return true; // stop handling the event
-    }
-  }
-
-  return QWidget::x11Event( xEvent );
-}
-
-#endif
-
-#else // QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-
 bool QVTK_RenderWindowInteractor
 ::nativeEvent(const QByteArray& eventType, void* message, long* result)
 {
@@ -524,22 +447,12 @@ bool QVTK_RenderWindowInteractor
   if ( eventType == "xcb_generic_event_t" )
   {
     xcb_generic_event_t* ev = static_cast<xcb_generic_event_t *>(message);
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    // TODO: this code is never called
-    if ( SVTK_SpaceMouseX* aSpaceMouse = SVTK_SpaceMouseX::getInstance() )
-#else
     if ( SVTK_SpaceMouseXCB* aSpaceMouse = SVTK_SpaceMouseXCB::getInstance() )
-#endif
     {
       if ( aSpaceMouse->isSpaceMouseOn() && ev->response_type == XCB_CLIENT_MESSAGE )
       {
         SVTK_SpaceMouse::MoveEvent anEvent;
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-        // TODO: this code is never called
-        int type = aSpaceMouse->translateEvent( QX11Info::display(), xEvent, &anEvent, 1.0, 1.0 );
-#else
         int type = aSpaceMouse->translateEvent( QX11Info::connection(), (xcb_client_message_event_t*)ev, &anEvent, 1.0, 1.0 );
-#endif
         switch ( type )
         {
         case SVTK_SpaceMouse::SpaceMouseMove:
@@ -558,7 +471,7 @@ bool QVTK_RenderWindowInteractor
 #endif
  return QWidget::nativeEvent( eventType, message, result );
 }
-#endif
+
 /*!
   Constructor
 */
diff --git a/src/SVTK/SVTK_RenderWindowInteractor.h b/src/SVTK/SVTK_RenderWindowInteractor.h
index c30efd2ee..feb30df6a 100644
--- a/src/SVTK/SVTK_RenderWindowInteractor.h
+++ b/src/SVTK/SVTK_RenderWindowInteractor.h
@@ -122,16 +122,7 @@ class SVTK_EXPORT QVTK_RenderWindowInteractor: public QWidget
   virtual void focusOutEvent( QFocusEvent* );
 
   //! To handle native events (from such devices as SpaceMouse)
-// TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-#if defined(WIN32)
-  virtual bool winEvent( MSG*, long* );
-#elif !defined(__APPLE__)
-  virtual bool x11Event( XEvent *e );
-#endif
-#else
   virtual bool nativeEvent( const QByteArray&, void*, long* );
-#endif
   vtkSmartPointer<vtkRenderWindow> myRenderWindow;
   vtkSmartPointer<vtkGenericRenderWindowInteractor> myDevice;
 };
diff --git a/src/SVTK/SVTK_SpaceMouse.cxx b/src/SVTK/SVTK_SpaceMouse.cxx
index eea14c671..4541bcfa4 100644
--- a/src/SVTK/SVTK_SpaceMouse.cxx
+++ b/src/SVTK/SVTK_SpaceMouse.cxx
@@ -35,20 +35,12 @@
 #include <X11/Xutil.h>
 #include <X11/Xatom.h>
 #include <X11/keysym.h>
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-#include <X11/Xlib.h>
-#else
 #include <xcb/xcb.h>
 #endif
-#endif
 
 #include "SVTK_SpaceMouse.h"
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-SVTK_SpaceMouseX* SVTK_SpaceMouseX::myInstance = 0;
-#else
 SVTK_SpaceMouseXCB* SVTK_SpaceMouseXCB::myInstance = 0;
-#endif
 
 /*!
   Constructor
@@ -57,174 +49,6 @@ SVTK_SpaceMouse::SVTK_SpaceMouse()
 {
   spaceMouseOn = 0;
 }
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-/*!
-  Constructor
-*/
-SVTK_SpaceMouseX::SVTK_SpaceMouseX()
-: SVTK_SpaceMouse()
-{
-#if !defined WIN32 && !defined __APPLE__
-  win = InputFocus;
-#endif
-}
-
-/*!
-  \return shared instance of object (creates if there is no one)
-*/
-SVTK_SpaceMouseX* SVTK_SpaceMouseX::getInstance()
-{
-  if ( !myInstance )
-    myInstance = new SVTK_SpaceMouseX();
-  return myInstance;
-}
-
-#if !defined WIN32 && !defined __APPLE__
-
-static int errorCallback( Display *display, XErrorEvent *Error )
-{
-  char msg[ 128 ];
-  if ( Error->error_code != BadWindow ) {
-    XGetErrorText( display,Error->error_code,msg,sizeof( msg ) );
-    fprintf( stderr, "SpaceMouse reported error = %s. Exit ... \n", msg );
-  }
-  return 0;
-}
-
-/*!
-  Initialization
-*/
-int SVTK_SpaceMouseX::initialize( Display *display, Window window )
-{
-  XMotionEvent        = XInternAtom( display, "MotionEvent",        1 );
-  XButtonPressEvent   = XInternAtom( display, "ButtonPressEvent",   1 );
-  XButtonReleaseEvent = XInternAtom( display, "ButtonReleaseEvent", 1 );
-  XCommandEvent       = XInternAtom( display, "CommandEvent",       1 );
-
-  spaceMouseOn = (XMotionEvent        != 0) &&
-                 (XButtonPressEvent   != 0) &&
-                 (XButtonReleaseEvent != 0) &&
-                 (XCommandEvent       != 0);
-  if ( !spaceMouseOn )
-    return 0;
-
-  spaceMouseOn = setWindow( display, window );
-  if ( !spaceMouseOn )
-    return 0;
- 
-  return spaceMouseOn;
-}
-
-/*!
-  Initialize by window
-*/
-int SVTK_SpaceMouseX::setWindow( Display *display, Window window )
-{
-  XTextProperty winName;
-  XEvent xEvent;
-  Atom type;
-  int format;
-  unsigned long NItems, BytesReturn;
-  unsigned char *PropReturn;
-  Window root;
-  int (*errorHandler)(Display *,XErrorEvent *);
-
-  errorHandler = XSetErrorHandler( errorCallback );
- 
-  root = RootWindow( display, DefaultScreen(display) );
-
-  PropReturn = NULL;
-  XGetWindowProperty( display, root, XCommandEvent, 0,1, 0,
-                      AnyPropertyType, &type, &format, &NItems,
-                      &BytesReturn, &PropReturn );
-
-  win = InputFocus;
-  if ( PropReturn != NULL ) {
-    win = *(Window *) PropReturn;
-    XFree( PropReturn );
-  }
-  else
-    return 0;
-
-  if ( XGetWMName( display, win, &winName ) == 0 )
-    return 0;
-
-  if ( strcmp( (char *) "Magellan Window", (char *) winName.value) != 0 )
-    return 0;
-
-  xEvent.type = ClientMessage;
-  xEvent.xclient.format = 16;
-  xEvent.xclient.send_event = 0;
-  xEvent.xclient.display = display;
-  xEvent.xclient.window = win;
-  xEvent.xclient.message_type = XCommandEvent;
-  
-  xEvent.xclient.data.s[0] = (short) ((window>>16)&0x0000FFFF);
-  xEvent.xclient.data.s[1] = (short)  (window&0x0000FFFF);
-  xEvent.xclient.data.s[2] = 27695;
-
-  if ( XSendEvent( display, win, 0, 0x0000, &xEvent ) == 0 )
-    return 0;
-
-  XFlush( display );
-
-  XSetErrorHandler( errorHandler );
-  return 1;
-}
-
-/*!
-  Close
-*/
-int SVTK_SpaceMouseX::close(Display *display)
-{
-  initialize( display, (Window)InputFocus );
-  spaceMouseOn = 0;
-  
-  return 1;
-}
-
-/*!
-  Custom event handler
-*/
-int SVTK_SpaceMouseX::translateEvent( Display* display, XEvent* xEvent, MoveEvent* spaceMouseEvent,
-                    double scale, double rScale )
-{
-  if ( !spaceMouseOn )
-    return 0;
-
-  if ( xEvent->type == ClientMessage ) {
-    if ( xEvent->xclient.message_type == XMotionEvent ) {
-      spaceMouseEvent->type = SpaceMouseMove;
-      spaceMouseEvent->data[ x ] =
-        xEvent->xclient.data.s[2] * scale;
-      spaceMouseEvent->data[ y ] =
-        xEvent->xclient.data.s[3] * scale;
-      spaceMouseEvent->data[ z ] =
-        xEvent->xclient.data.s[4] * scale;
-      spaceMouseEvent->data[ a ] =
-        xEvent->xclient.data.s[5] * rScale;
-      spaceMouseEvent->data[ b ] =
-        xEvent->xclient.data.s[6] * rScale;
-      spaceMouseEvent->data[ c ] =
-        xEvent->xclient.data.s[7] * rScale;
-      spaceMouseEvent->period = xEvent->xclient.data.s[8];
-      return 1;
-    }
-    else if ( xEvent->xclient.message_type == XButtonPressEvent ) {
-      spaceMouseEvent->type = SpaceButtonPress;
-      spaceMouseEvent->button = xEvent->xclient.data.s[2];
-      return 2;
-    }
-    else if ( xEvent->xclient.message_type == XButtonReleaseEvent ) {
-      spaceMouseEvent->type = SpaceButtonRelease;
-      spaceMouseEvent->button = xEvent->xclient.data.s[2];
-      return 3;
-    }
-  }
-  return (!display);
-}
-#endif
-#else
 
 /*!
   Constructor
@@ -399,4 +223,3 @@ int SVTK_SpaceMouseXCB::translateEvent( xcb_connection_t* connection, xcb_client
   return (!connection);
 }
 #endif
-#endif
diff --git a/src/SVTK/SVTK_SpaceMouse.h b/src/SVTK/SVTK_SpaceMouse.h
index 18e2eacd4..40d7fe8b9 100644
--- a/src/SVTK/SVTK_SpaceMouse.h
+++ b/src/SVTK/SVTK_SpaceMouse.h
@@ -33,11 +33,7 @@
 extern "C"
 {
 #include <X11/X.h>
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-#include <X11/Xlib.h>
-#else
 #include <xcb/xcb.h>
-#endif
 }
 #endif
 
@@ -64,37 +60,6 @@ class SVTK_SpaceMouse
   int spaceMouseOn;
 };
 
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-
-class SVTK_SpaceMouseX: public SVTK_SpaceMouse
-{
-
-public:
-  SVTK_SpaceMouseX();
-
-  // access to SpaceMouse utility class
-  static SVTK_SpaceMouseX* getInstance();
-
-#if !defined WIN32 && !defined __APPLE__
-  int initialize     ( Display*, Window );
-  int setWindow      ( Display*, Window );
-  int translateEvent ( Display*, XEvent*, MoveEvent*, double, double );
-  int close          ( Display* );
-
-private:
-  Atom XMotionEvent;
-  Atom XButtonPressEvent;
-  Atom XButtonReleaseEvent;
-  Atom XCommandEvent;
-  Window win;
-#endif
-
-  static SVTK_SpaceMouseX* myInstance;
-
-};
-
-#else
-
 class SVTK_SpaceMouseXCB: public SVTK_SpaceMouse
 {
 
@@ -122,4 +87,3 @@ private:
 };
 
 #endif
-#endif
diff --git a/src/SalomeApp/SalomeApp_ListView.cxx b/src/SalomeApp/SalomeApp_ListView.cxx
index 4606313be..62b52d73a 100644
--- a/src/SalomeApp/SalomeApp_ListView.cxx
+++ b/src/SalomeApp/SalomeApp_ListView.cxx
@@ -84,11 +84,7 @@ SalomeApp_ListView::SalomeApp_ListView( QWidget* parent )
   setRootIsDecorated(false);
   setAllColumnsShowFocus(false);
 //  header()->setClickEnabled(false);
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  header()->setMovable(false);
-#else
   header()->setSectionsMovable(false);
-#endif
 
   myEditedItem = 0;
   myEdit = 0;
diff --git a/src/Session/SALOME_Session_Server.cxx b/src/Session/SALOME_Session_Server.cxx
index ea2748167..28092c9a9 100644
--- a/src/Session/SALOME_Session_Server.cxx
+++ b/src/Session/SALOME_Session_Server.cxx
@@ -263,13 +263,7 @@ class SALOME_QApplication : public QApplication
 public:
   SALOME_QApplication( int& argc, char** argv )
 // TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if !defined(WIN32) && !defined(__APPLE__) && (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
-  // san: Opening an X display and choosing a visual most suitable for 3D visualization
-  // in order to make SALOME viewers work with non-native X servers
-  : QApplication( (Display*)Qtx::getDisplay(), argc, argv, Qtx::getVisual() ),
-#else
   : QApplication( argc, argv ), 
-#endif
     myHandler ( 0 ) {}
 
   virtual bool notify( QObject* receiver, QEvent* e )
@@ -355,16 +349,6 @@ int main( int argc, char **argv )
   SessionMsgHandler msgHandler;
   qInstallMessageHandler(QtxMsgHandler);
 
-// TODO (QT5 PORTING) Below is a temporary solution, to allow compiling with Qt 5
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  //Set a "native" graphic system in case if application runs on the remote host
-  QString remote(getenv("REMOTEHOST"));
-  QString client(getenv("SSH_CLIENT"));
-  if(remote.length() > 0 || client.length() > 0 ) {
-    QApplication::setGraphicsSystem(QLatin1String("native"));
-  }
-#endif
-
   // add <qtdir>/plugins dir to the pluins search path for image plugins
   QString qtdir = Qtx::qtDir( "plugins" );
   if ( !qtdir.isEmpty() )
@@ -384,15 +368,12 @@ int main( int argc, char **argv )
     }
   }
   
-#if QT_VERSION > QT_VERSION_CHECK(5, 0, 0)
-
   // RNV: setup the default format:
   // QSurfaceFormat should be set before creation of QApplication,  
   // so to avoid conflicts beetween SALOME and ParaView QSurfaceFormats we should merge theirs formats
   // (see void Qtx::initDefaultSurfaceFormat()) and set the resultant format here.
   Qtx::initDefaultSurfaceFormat(); 
 
-#endif
 
   // Create Qt application instance;
   // this should be done the very first!
diff --git a/src/Style/Style_Salome.cxx b/src/Style/Style_Salome.cxx
index 88733a2a3..2e3012529 100644
--- a/src/Style/Style_Salome.cxx
+++ b/src/Style/Style_Salome.cxx
@@ -1638,9 +1638,6 @@ void Style_Salome::drawPrimitive( PrimitiveElement pe, const QStyleOption* opt,
         p->setPen(opt->palette.text().color());
      } // Fall through!
     case PE_IndicatorViewItemCheck:
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    case PE_Q3CheckListIndicator:
-#endif
     {
       if (!doRestore) {
         p->save();
@@ -2107,11 +2104,7 @@ QIcon Style_Salome::standardIconImplementation( StandardPixmap standardIcon,
                                                 const QWidget* w ) const
 {
   if ( checkDebugLevel(10) ) {
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-    return BaseStyle::standardIconImplementation( standardIcon, opt, w );
-#else
     return QCommonStyle::standardIcon( standardIcon, opt, w );
-#endif
   }
 
   switch ( standardIcon )
@@ -2127,11 +2120,7 @@ QIcon Style_Salome::standardIconImplementation( StandardPixmap standardIcon,
   default:
     break;
   }
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-  return BaseStyle::standardIconImplementation( standardIcon, opt, w );
-#else
   return BaseStyle::standardIcon( standardIcon, opt, w );
-#endif
 }
 
 /*!
diff --git a/src/Style/Style_Salome.h b/src/Style/Style_Salome.h
index 77a0f14e5..066d01ca9 100644
--- a/src/Style/Style_Salome.h
+++ b/src/Style/Style_Salome.h
@@ -25,13 +25,9 @@
 
 #include <QtGlobal>
 #include "Style.h"
-#if QT_VERSION < QT_VERSION_CHECK(5, 0, 0)
-#include <QWindowsStyle>
-#define BaseStyle QWindowsStyle
-#else
 #include <QCommonStyle>
 #define BaseStyle QCommonStyle
-#endif
+
 class Style_Model;
 
 class QApplication;
diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index b64d4fd34..502ff86c2 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -29,7 +29,6 @@ IF(SALOME_USE_PYCONSOLE)
   SET(PYCONSOLE_INSTALL_LIBS "${SALOME_INSTALL_LIBS}" CACHE PATH "")
   SET(PYCONSOLE_INSTALL_HEADERS "${SALOME_INSTALL_HEADERS}" CACHE PATH "") 
   SET(PYCONSOLE_INSTALL_RES "${SALOME_GUI_INSTALL_RES_DATA}" CACHE PATH "")
-  OPTION(PYCONSOLE_BUILD_WITH_QT5 "Build PyConsole with Qt 5" ${SALOME_BUILD_WITH_QT5})
      
   ADD_SUBDIRECTORY(../tools/PyConsole) # will bring in PyInterp automatically
 ENDIF(SALOME_USE_PYCONSOLE)
@@ -41,7 +40,6 @@ IF(SALOME_USE_PYVIEWER)
   SET(PYEDITOR_INSTALL_LIBS "${SALOME_INSTALL_LIBS}" CACHE PATH "")
   SET(PYEDITOR_INSTALL_HEADERS "${SALOME_INSTALL_HEADERS}" CACHE PATH "") 
   SET(PYEDITOR_INSTALL_RES "${SALOME_GUI_INSTALL_RES_DATA}" CACHE PATH "")
-  OPTION(PYEDITOR_BUILD_WITH_QT5 "Build PyEditor with Qt 5" ${SALOME_BUILD_WITH_QT5})
   ADD_SUBDIRECTORY(PyEditor)
 ENDIF(SALOME_USE_PYVIEWER)
 
diff --git a/tools/PyConsole/CMakeLists.txt b/tools/PyConsole/CMakeLists.txt
index 2e639d297..829884192 100644
--- a/tools/PyConsole/CMakeLists.txt
+++ b/tools/PyConsole/CMakeLists.txt
@@ -44,7 +44,6 @@ INCLUDE(SalomeSetupPlatform)
 
 # Options
 # =======
-OPTION(PYCONSOLE_BUILD_WITH_QT5 "Build PYCONSOLE with Qt 5" ON)
 OPTION(PYCONSOLE_BUILD_PYTHON "Build Python wrapping for PyConsole" ON)
 
 #
@@ -55,24 +54,14 @@ FIND_PACKAGE(SalomePythonInterp REQUIRED)
 FIND_PACKAGE(SalomePythonLibs REQUIRED)
 
 # Qt
-IF(NOT PYCONSOLE_BUILD_WITH_QT5)
-  FIND_PACKAGE(SalomeQt4 REQUIRED)
-ELSE()
-  FIND_PACKAGE(SalomeQt5 REQUIRED)
-ENDIF()
-
+FIND_PACKAGE(SalomeQt5 REQUIRED)
 IF(PYCONSOLE_BUILD_PYTHON)
   # Sip
   FIND_PACKAGE(SalomeSIP REQUIRED)  # should come after Python and before PyQt
   SALOME_LOG_OPTIONAL_PACKAGE(SalomeSIP PYCONSOLE_BUILD_PYTHON)
   # PyQt
-  IF (NOT PYCONSOLE_BUILD_WITH_QT5)
-    FIND_PACKAGE(SalomePyQt4 REQUIRED)
-    SALOME_LOG_OPTIONAL_PACKAGE(SalomePyQt4 PYCONSOLE_BUILD_PYTHON)
-  ELSE()
-    FIND_PACKAGE(SalomePyQt5 REQUIRED)
-    SALOME_LOG_OPTIONAL_PACKAGE(SalomePyQt5 PYCONSOLE_BUILD_PYTHON)
-  ENDIF()
+  FIND_PACKAGE(SalomePyQt5 REQUIRED)
+  SALOME_LOG_OPTIONAL_PACKAGE(SalomePyQt5 PYCONSOLE_BUILD_PYTHON)
 ENDIF(PYCONSOLE_BUILD_PYTHON)
 
 # Detection report
@@ -94,7 +83,6 @@ SET(PYCONSOLE_INSTALL_RES share/resources CACHE PATH "Install path: PyConsole re
 SET(PYINTERP_INSTALL_LIBS "${PYCONSOLE_INSTALL_LIBS}"  CACHE PATH "")
 SET(PYINTERP_INSTALL_HEADERS "${PYCONSOLE_INSTALL_HEADERS}" CACHE PATH "")
 SET(PYINTERP_INSTALL_RES "${PYCONSOLE_INSTALL_RES}" CACHE PATH "")
-OPTION(PYINTERP_BUILD_WITH_QT5 "Build PYCONSOLE with Qt 5" ${PYCONSOLE_BUILD_WITH_QT5})
 
 ADD_SUBDIRECTORY(${PROJECT_SOURCE_DIR}/../PyInterp ${PROJECT_BINARY_DIR}/PyInterp)
 INCLUDE_DIRECTORIES(${PROJECT_SOURCE_DIR}/../PyInterp/src)
diff --git a/tools/PyEditor/CMakeLists.txt b/tools/PyEditor/CMakeLists.txt
index 92b14f6cb..414c8ea80 100644
--- a/tools/PyEditor/CMakeLists.txt
+++ b/tools/PyEditor/CMakeLists.txt
@@ -44,7 +44,6 @@ INCLUDE(SalomeSetupPlatform)
 
 # Options
 # =======
-OPTION(PYEDITOR_BUILD_WITH_QT5 "Build PyEditor with Qt 5" ON)
 OPTION(PYEDITOR_BUILD_SHARED_LIBS "Build shared libraries for PyEditor" ON)
 OPTION(PYEDITOR_BUILD_EXE "Build PyEditor's executable" ON)
 OPTION(PYEDITOR_BUILD_PYTHON "Build Python wrapping for PyEditor" ON)
@@ -60,12 +59,7 @@ ELSE(PYEDITOR_BUILD_SHARED_LIBS)
 ENDIF(PYEDITOR_BUILD_SHARED_LIBS)
 
 # Qt
-IF(NOT PYEDITOR_BUILD_WITH_QT5)
-  FIND_PACKAGE(SalomeQt4 REQUIRED)
-ELSE()
-  FIND_PACKAGE(SalomeQt5 REQUIRED)
-ENDIF()
-
+FIND_PACKAGE(SalomeQt5 REQUIRED)
 IF(PYEDITOR_BUILD_PYTHON)
   # Python
   FIND_PACKAGE(SalomePythonInterp REQUIRED)
@@ -76,13 +70,8 @@ IF(PYEDITOR_BUILD_PYTHON)
   FIND_PACKAGE(SalomeSIP REQUIRED)  # should come after Python and before PyQt
   SALOME_LOG_OPTIONAL_PACKAGE(SalomeSIP PYEDITOR_BUILD_PYTHON)
   # PyQt
-  IF (NOT PYEDITOR_BUILD_WITH_QT5)
-    FIND_PACKAGE(SalomePyQt4 REQUIRED)
-    SALOME_LOG_OPTIONAL_PACKAGE(SalomePyQt4 PYEDITOR_BUILD_PYTHON)
-  ELSE()
-    FIND_PACKAGE(SalomePyQt5 REQUIRED)
-    SALOME_LOG_OPTIONAL_PACKAGE(SalomePyQt5 PYEDITOR_BUILD_PYTHON)
-  ENDIF()
+  FIND_PACKAGE(SalomePyQt5 REQUIRED)
+  SALOME_LOG_OPTIONAL_PACKAGE(SalomePyQt5 PYEDITOR_BUILD_PYTHON)
 ENDIF(PYEDITOR_BUILD_PYTHON)
 
 # Detection report
diff --git a/tools/PyInterp/CMakeLists.txt b/tools/PyInterp/CMakeLists.txt
index 45131eaef..2b5da6adb 100644
--- a/tools/PyInterp/CMakeLists.txt
+++ b/tools/PyInterp/CMakeLists.txt
@@ -44,7 +44,6 @@ INCLUDE(SalomeSetupPlatform)
 
 # Options
 # =======
-OPTION(PYINTERP_BUILD_WITH_QT5 "Build PYINTERP with Qt 5" ON)
 
 #
 # Set list of prerequisites
@@ -53,11 +52,7 @@ OPTION(PYINTERP_BUILD_WITH_QT5 "Build PYINTERP with Qt 5" ON)
 FIND_PACKAGE(SalomePythonInterp REQUIRED)
 FIND_PACKAGE(SalomePythonLibs REQUIRED)
 # Qt
-IF(NOT PYINTERP_BUILD_WITH_QT5)
-  FIND_PACKAGE(SalomeQt4 REQUIRED)
-ELSE()
-  FIND_PACKAGE(SalomeQt5 REQUIRED)
-ENDIF()
+FIND_PACKAGE(SalomeQt5 REQUIRED)
 
 # Detection report
 SALOME_PACKAGE_REPORT_AND_CHECK()