diff --git a/bin/syncqt b/bin/syncqt
index 8fa253a733e..3d25ecc817b 100755
--- a/bin/syncqt
+++ b/bin/syncqt
@@ -747,6 +747,21 @@ mkpath "$out_basedir/include/Qt", !$quiet;
 foreach my $lib (@modules_to_sync) {
     #iteration info
     my $dir = $modules{$lib};
+    my $module_version = "";
+
+    if (-e "$modulepris{$lib}") {
+        my $content = fileContents($modulepris{$lib});
+        my @version_rows = grep(/QT\..*\.VERSION/, split('\n', $content));
+        if(@version_rows) {
+            # We only pick the first one, since each module need a separate .pri file
+            $module_version = $version_rows[0];
+            chomp $module_version;
+            $module_version =~ s/^\s*QT\..*\.VERSION\s*=\s*([^#]+).*$/$1/;
+            $module_version =~ s/\s+$//;
+        }
+    }
+    print "WARNING: Module $lib\'s pri missing QT.<module>.VERSION variable! Private headers not versioned!\n" if (!$module_version);
+
     my $pathtoheaders = "";
     $pathtoheaders = $moduleheaders{$lib} if ($moduleheaders{$lib});
 
@@ -766,6 +781,7 @@ foreach my $lib (@modules_to_sync) {
                 chomp $line;
                 if($line =~ /^ *QT *\+?= *([^\r\n]*)/) {
                     foreach(split(/ /, $1)) {
+                        $_ =~ s/-private$//;
                         my $content = $mastercontent{$_};
                         $master_contents .= $content if ($content);
                     }
@@ -913,7 +929,11 @@ foreach my $lib (@modules_to_sync) {
                                 }
                             }
                         } elsif ($create_private_headers) {
-                            @headers = ( "$out_basedir/include/$lib/private/$header" );
+                            if ($module_version) {
+                                @headers = ( "$out_basedir/include/$lib/$module_version/$lib/private/$header" );
+                            } else {
+                                @headers = ( "$out_basedir/include/$lib/private/$header" );
+                            }
                         }
                         foreach(@headers) { #sync them
                             $header_copies++ if(syncHeader($_, $iheader, $copy_headers && !$shadow, $ts));
diff --git a/configure b/configure
index 60e1ec12163..293f642d356 100755
--- a/configure
+++ b/configure
@@ -4921,7 +4921,7 @@ if true; then ###[ '!' -f "$outpath/bin/qmake" ];
             -e "s,@QT_INSTALL_BINS@,\$(INSTALL_ROOT)$QMAKE_BIN_DIR,g" \
             -e "s,@QT_INSTALL_DATA@,\$(INSTALL_ROOT)$QMAKE_DATA_DIR,g" \
             -e "s,@QMAKE_QTOBJS@,$EXTRA_OBJS,g" -e "s,@QMAKE_QTSRCS@,$EXTRA_SRCS,g" \
-	    -e "s,@QMAKESPEC@,$adjqmakespec,g" "$in_mkfile" >>"$mkfile"
+            -e "s,@QMAKESPEC@,$adjqmakespec,g" -e "s,@QT_VERSION@,$QT_VERSION,g" "$in_mkfile" >>"$mkfile"
 
         if "$WHICH" makedepend >/dev/null 2>&1 && grep 'depend:' "$mkfile" >/dev/null 2>&1; then
             (cd "$outpath/qmake" && "$MAKE" -f "$mkfile" depend) >/dev/null 2>&1
@@ -8500,7 +8500,7 @@ CACHEFILE="$outpath/.qmake.cache"
 [ -f "$CACHEFILE.tmp" ] && rm -f "$CACHEFILE.tmp"
 cat >>"$CACHEFILE.tmp" <<EOF
 include(\$\$PWD/mkspecs/qmodule.pri)
-CONFIG += $QMAKE_CONFIG dylib create_prl link_prl depend_includepath fix_output_dirs QTDIR_build
+CONFIG += $QMAKE_CONFIG dylib create_prl link_prl depend_includepath fix_output_dirs no_private_qt_headers_warning QTDIR_build
 QMAKE_ABSOLUTE_SOURCE_ROOT = \$\$QT_SOURCE_TREE
 QMAKE_MOC_SRC    = \$\$QT_BUILD_TREE/src/moc
 
diff --git a/demos/shared/shared.pro b/demos/shared/shared.pro
index b2a338e7f3b..88d7fbedaba 100644
--- a/demos/shared/shared.pro
+++ b/demos/shared/shared.pro
@@ -11,6 +11,7 @@ build_all:!build_pass {
     CONFIG += release
 }
 TARGET = demo_shared
+QT += gui-private
 
 SOURCES += \
 	arthurstyle.cpp\
diff --git a/mkspecs/features/designer.prf b/mkspecs/features/designer.prf
index fa40caab3f8..63a7e76a346 100644
--- a/mkspecs/features/designer.prf
+++ b/mkspecs/features/designer.prf
@@ -4,4 +4,4 @@ qt:load(qt)
 
 plugin:DEFINES += QDESIGNER_EXPORT_WIDGETS
 
-qtAddLibrary(QtDesigner)
+qtAddLibrary(QtDesigner, true)
diff --git a/mkspecs/features/help.prf b/mkspecs/features/help.prf
index d8ba8c3537b..c96ecae8fed 100644
--- a/mkspecs/features/help.prf
+++ b/mkspecs/features/help.prf
@@ -1,3 +1,3 @@
 QT += xml sql
 
-qtAddModule(help)
+qtAddModule(help, true)
diff --git a/mkspecs/features/qt.prf b/mkspecs/features/qt.prf
index 21fdd38e702..61e1d575bca 100644
--- a/mkspecs/features/qt.prf
+++ b/mkspecs/features/qt.prf
@@ -131,7 +131,16 @@ QMAKE_LIBDIR += $$QMAKE_LIBDIR_QT
 QT = $$resolve_depends($$QT, "QT.")
 QT_DEPENDS=
 
+unset(using_privates)
 for(QTLIB, $$list($$lower($$unique(QT)))) {
+    # Figure out if we're wanting to use the private headers of a module
+    contains(QTLIB, .*-private) {
+        QTLIB ~= s/-private//
+        use_private = UsePrivate
+    } else {
+        use_private = NoPrivate
+    }
+
     isEmpty(QT.$${QTLIB}.name) {
         message("Warning: unknown QT module: $$QTLIB")
         next()
@@ -141,14 +150,21 @@ for(QTLIB, $$list($$lower($$unique(QT)))) {
         warning($$TARGET cannot have a QT of $$QTLIB)
         next()
     }
-    qtAddModule($$QTLIB)
+    qtAddModule($$QTLIB, $$use_private)
     QT_DEPENDS += $$eval(QT.$${QTLIB}.depends)
+    isEqual(use_private, UsePrivate):using_privates = true
 }
 
 # add include paths for all .depends, since module/application might need f.ex. template specializations etc.
 QT_DEPENDS -= $$QT
 for(QTLIB, $$list($$lower($$unique(QT_DEPENDS)))):INCLUDEPATH += $$INCLUDEPATH $$eval(QT.$${QTLIB}.includes)
 
+!isEmpty(using_privates):!no_private_qt_headers_warning:if(!debug_and_release|!build_pass) {
+    message("This project is using private headers and will therefore be tied to this specific Qt module build version.")
+    message("Running this project against other versions of the Qt modules may crash at any arbitrary point.")
+    message("This is not a bug, but a result of using Qt internals. You have been warned!")
+}
+
 qt_compat {
    !qt_compat_no_warning:QTDIR_build:warning(***USE of COMPAT inside of QTDIR!**) #just for us
    INCLUDEPATH *= $$QMAKE_INCDIR_QT/Qt
diff --git a/mkspecs/features/qt_functions.prf b/mkspecs/features/qt_functions.prf
index b16c84864fe..50a85d86ce9 100644
--- a/mkspecs/features/qt_functions.prf
+++ b/mkspecs/features/qt_functions.prf
@@ -102,6 +102,16 @@ defineTest(qtAddModule) {
 
     INCLUDEPATH -= $$MODULE_INCLUDES
     INCLUDEPATH = $$MODULE_INCLUDES $$INCLUDEPATH
+    isEqual(2, UsePrivate) { # Tests function parameter 2 ($$2) being equal to 'UsePrivate'
+        # This adds both
+        #     <module privates include path>/
+        # and <module privates include path>/<module name>
+        # since we have code using both #include <QtCore/private/foo> and #include <private/foo>
+        # Both need to be supported with the new private includes structure
+        MODULE_INCLUDES_PRIVATES = $$eval(QT.$${1}.private_includes)
+        INCLUDEPATH -= $$MODULE_INCLUDES_PRIVATES $$MODULE_INCLUDES_PRIVATES/$$MODULE_NAME
+        INCLUDEPATH = $$MODULE_INCLUDES_PRIVATES $$MODULE_INCLUDES_PRIVATES/$$MODULE_NAME $$INCLUDEPATH
+    }
 
     unset(LINKAGE)
     mac {
@@ -140,12 +150,16 @@ defineTest(qtAddModule) {
        }
        isEmpty(LINKAGE):LINKAGE = -l$${MODULE_NAME}$${QT_LIBINFIX}
     }
-    !isEmpty(QMAKE_LSB) {
-        QMAKE_LFLAGS *= --lsb-libpath=$$$$QMAKE_LIBDIR_QT
-        QMAKE_LFLAGS *= -L/opt/lsb/lib
-        QMAKE_LFLAGS *= --lsb-shared-libs=$${MODULE_NAME}$${QT_LIBINFIX}
+    # Only link to this module if a libs directory is set, else this is just a module
+    # to give access to sources or include files, and not for linking.
+    !isEmpty(MODULE_LIBS) {
+        !isEmpty(QMAKE_LSB) {
+            QMAKE_LFLAGS *= --lsb-libpath=$$$$QMAKE_LIBDIR_QT
+            QMAKE_LFLAGS *= -L/opt/lsb/lib
+            QMAKE_LFLAGS *= --lsb-shared-libs=$${MODULE_NAME}$${QT_LIBINFIX}
+        }
+        LIBS += $$LINKAGE
     }
-    LIBS += $$LINKAGE
     export(CONFIG)
     export(DEFINES)
     export(LIBS)
diff --git a/qmake/Makefile.unix b/qmake/Makefile.unix
index 9dbe035fc26..c522779981f 100644
--- a/qmake/Makefile.unix
+++ b/qmake/Makefile.unix
@@ -1,5 +1,6 @@
 SOURCE_PATH = @SOURCE_PATH@
 BUILD_PATH = @BUILD_PATH@
+QT_VERSION = @QT_VERSION@
 QTOBJS = @QMAKE_QTOBJS@
 QTSRCS = @QMAKE_QTSRCS@
 QMAKESPEC = @QMAKESPEC@
@@ -76,6 +77,7 @@ DEPEND_SRC=project.cpp property.cpp meta.cpp main.cpp generators/makefile.cpp ge
 CPPFLAGS = -g -I. -Igenerators -Igenerators/unix -Igenerators/win32 \
            -Igenerators/mac -Igenerators/symbian -Igenerators/integrity \
 	   -I$(BUILD_PATH)/include -I$(BUILD_PATH)/include/QtCore \
+	   -I$(BUILD_PATH)/include/QtCore/$(QT_VERSION) -I$(BUILD_PATH)/include/QtCore/$(QT_VERSION)/QtCore \
 	   -I$(BUILD_PATH)/src/corelib/global -I$(BUILD_PATH)/src/corelib/xml \
 	   -I$(SOURCE_PATH)/tools/shared \
 	   -DQT_NO_PCRE \
diff --git a/qmake/Makefile.win32 b/qmake/Makefile.win32
index 6fd393993e9..56ccf3d5655 100644
--- a/qmake/Makefile.win32
+++ b/qmake/Makefile.win32
@@ -32,8 +32,8 @@ CFLAGS_BARE = -c -Fo./ \
               -W3 -nologo -O2 \
               $(CFLAGS_EXTRA) \
               -I. -Igenerators -Igenerators\unix -Igenerators\win32 -Igenerators\mac -Igenerators\symbian -Igenerators\integrity \
-              -I$(BUILD_PATH)\include -I$(BUILD_PATH)\include\QtCore \
-              -I$(SOURCE_PATH)\include -I$(SOURCE_PATH)\include\QtCore \
+              -I$(BUILD_PATH)\include -I$(BUILD_PATH)\include\QtCore -I$(BUILD_PATH)\include\QtCore\$(QT_VERSION) -I$(BUILD_PATH)\include\QtCore\$(QT_VERSION)\QtCore \
+              -I$(SOURCE_PATH)\include -I$(SOURCE_PATH)\include\QtCore -I$(SOURCE_PATH)\include\QtCore\$(QT_VERSION) -I$(SOURCE_PATH)\include\QtCore\$(QT_VERSION)\QtCore \
               -I$(BUILD_PATH)\src\corelib\global \
               -I$(BUILD_PATH)\src\corelib\xml \
               -I$(SOURCE_PATH)\mkspecs\$(QMAKESPEC)  \
diff --git a/qmake/Makefile.win32-g++ b/qmake/Makefile.win32-g++
index d40dc29a9b8..05d7a154d68 100644
--- a/qmake/Makefile.win32-g++
+++ b/qmake/Makefile.win32-g++
@@ -16,8 +16,8 @@ CFLAGS	    =	-c -o$@ -O \
 		-I. -Igenerators -Igenerators/unix \
 		-Igenerators/win32 -Igenerators/mac \
 		-Igenerators/symbian -Igenerators/integrity \
-		-I$(BUILD_PATH)/include -I$(BUILD_PATH)/include/QtCore \
-		-I$(SOURCE_PATH)/include -I$(SOURCE_PATH)/include/QtCore \
+		-I$(BUILD_PATH)/include -I$(BUILD_PATH)/include/QtCore -I$(BUILD_PATH)/include/QtCore/$(QT_VERSION) -I$(BUILD_PATH)/include/QtCore/$(QT_VERSION)/QtCore \
+		-I$(SOURCE_PATH)/include -I$(SOURCE_PATH)/include/QtCore -I$(SOURCE_PATH)/include/QtCore/$(QT_VERSION) -I$(SOURCE_PATH)/include/QtCore/$(QT_VERSION)/QtCore \
 		-I$(BUILD_PATH)/src/corelib/global \
 		-I$(BUILD_PATH)/src/corelib/xml \
 		-I$(SOURCE_PATH)/mkspecs/win32-g++  \
diff --git a/qmake/Makefile.win32-g++-sh b/qmake/Makefile.win32-g++-sh
index 49ccfbcc77b..b691470cca8 100644
--- a/qmake/Makefile.win32-g++-sh
+++ b/qmake/Makefile.win32-g++-sh
@@ -16,8 +16,8 @@ CFLAGS	    =	-c -o$@ -O \
 		-I. -Igenerators -Igenerators/unix \
 		-Igenerators/win32 -Igenerators/mac \
 		-Igenerators/symbian -Igenerators/integrity \
-		-I$(BUILD_PATH)/include -I$(BUILD_PATH)/include/QtCore \
-		-I$(SOURCE_PATH)/include -I$(SOURCE_PATH)/include/QtCore \
+		-I$(BUILD_PATH)/include -I$(BUILD_PATH)/include/QtCore -I$(BUILD_PATH)/include/QtCore/$(QT_VERSION) -I$(BUILD_PATH)/include/QtCore/$(QT_VERSION)/QtCore \
+		-I$(SOURCE_PATH)/include -I$(SOURCE_PATH)/include/QtCore -I$(SOURCE_PATH)/include/QtCore/$(QT_VERSION) -I$(SOURCE_PATH)/include/QtCore/$(QT_VERSION)/QtCore \
 		-I$(BUILD_PATH)/src/corelib/global \
 		-I$(BUILD_PATH)/src/corelib/xml \
 		-I$(SOURCE_PATH)/mkspecs/win32-g++  \
diff --git a/qmake/qmake.pro b/qmake/qmake.pro
index b602afa1981..ac52bd8dd0e 100644
--- a/qmake/qmake.pro
+++ b/qmake/qmake.pro
@@ -27,6 +27,8 @@ INCLUDEPATH += . \
            generators/symbian \
            $$QT_SOURCE_TREE/include \
            $$QT_SOURCE_TREE/include/QtCore \
+           $$QT_SOURCE_TREE/include/QtCore/$$QT_VERSION \
+           $$QT_SOURCE_TREE/include/QtCore/$$QT_VERSION/QtCore \
            $$QT_SOURCE_TREE/qmake
 
 VPATH += $$QT_SOURCE_TREE/tools/shared
diff --git a/src/dbus/dbus.pro b/src/dbus/dbus.pro
index 4f2aa7e9b58..e73fa05a748 100644
--- a/src/dbus/dbus.pro
+++ b/src/dbus/dbus.pro
@@ -1,6 +1,6 @@
 TARGET = QtDBus
 QPRO_PWD = $$PWD
-QT = core \
+QT = core-private \
     xml
 
 CONFIG += link_pkgconfig module
diff --git a/src/gui/gui.pro b/src/gui/gui.pro
index 878a3846963..072553a05cf 100644
--- a/src/gui/gui.pro
+++ b/src/gui/gui.pro
@@ -1,6 +1,6 @@
 TARGET     = QtGui
 QPRO_PWD   = $$PWD
-QT = core
+QT = core-private
 
 CONFIG += module
 MODULE_PRI = ../modules/qt_gui.pri
diff --git a/src/modules/qt_core.pri b/src/modules/qt_core.pri
index 9636fb25000..bf013432a5c 100644
--- a/src/modules/qt_core.pri
+++ b/src/modules/qt_core.pri
@@ -1,12 +1,12 @@
-QT_CORE_VERSION = $$QT_VERSION
-QT_CORE_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_CORE_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_CORE_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.core.VERSION = 4.8.0
+QT.core.MAJOR_VERSION = 4
+QT.core.MINOR_VERSION = 8
+QT.core.PATCH_VERSION = 0
 
 QT.core.name = QtCore
 QT.core.bins = $$QT_MODULE_BIN_BASE
 QT.core.includes = $$QT_MODULE_INCLUDE_BASE/QtCore
-QT.core.private_includes = $$QT_MODULE_INCLUDE_BASE/QtCore/private
+QT.core.private_includes = $$QT_MODULE_INCLUDE_BASE/QtCore/$$QT.core.VERSION
 QT.core.sources = $$QT_MODULE_BASE/src/corelib
 QT.core.libs = $$QT_MODULE_LIB_BASE
 QT.core.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_dbus.pri b/src/modules/qt_dbus.pri
index 13c9914f0db..9aefab9b82a 100644
--- a/src/modules/qt_dbus.pri
+++ b/src/modules/qt_dbus.pri
@@ -1,12 +1,12 @@
-QT_DBUS_VERSION = $$QT_VERSION
-QT_DBUS_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_DBUS_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_DBUS_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.dbus.VERSION = 4.8.0
+QT.dbus.MAJOR_VERSION = 4
+QT.dbus.MINOR_VERSION = 8
+QT.dbus.PATCH_VERSION = 0
 
 QT.dbus.name = QtDBus
 QT.dbus.bins = $$QT_MODULE_BIN_BASE
 QT.dbus.includes = $$QT_MODULE_INCLUDE_BASE/QtDBus
-QT.dbus.private_includes = $$QT_MODULE_INCLUDE_BASE/QtDBus/private
+QT.dbus.private_includes = $$QT_MODULE_INCLUDE_BASE/QtDBus/$$QT.dbus.VERSION
 QT.dbus.sources = $$QT_MODULE_BASE/src/dbus
 QT.dbus.libs = $$QT_MODULE_LIB_BASE
 QT.dbus.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_gui.pri b/src/modules/qt_gui.pri
index 444f5c48047..1ef3697db6c 100644
--- a/src/modules/qt_gui.pri
+++ b/src/modules/qt_gui.pri
@@ -1,11 +1,11 @@
-QT_GUI_VERSION = $$QT_VERSION
-QT_GUI_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_GUI_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_GUI_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.gui.VERSION = 4.8.0
+QT.gui.MAJOR_VERSION = 4
+QT.gui.MINOR_VERSION = 8
+QT.gui.PATCH_VERSION = 0
 
 QT.gui.name = QtGui
 QT.gui.includes = $$QT_MODULE_INCLUDE_BASE/QtGui
-QT.gui.private_includes = $$QT_MODULE_INCLUDE_BASE/QtGui/private
+QT.gui.private_includes = $$QT_MODULE_INCLUDE_BASE/QtGui/$$QT.gui.VERSION
 QT.gui.sources = $$QT_MODULE_BASE/src/gui
 QT.gui.libs = $$QT_MODULE_LIB_BASE
 QT.gui.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_network.pri b/src/modules/qt_network.pri
index f54afd21a0d..44326c2b2db 100644
--- a/src/modules/qt_network.pri
+++ b/src/modules/qt_network.pri
@@ -1,12 +1,12 @@
-QT_CORE_VERSION = $$QT_VERSION
-QT_NETWORK_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_NETWORK_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_NETWORK_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.network.VERSION = 4.8.0
+QT.network.MAJOR_VERSION = 4
+QT.network.MINOR_VERSION = 8
+QT.network.PATCH_VERSION = 0
 
 QT.network.name = QtNetwork
 QT.network.bins = $$QT_MODULE_BIN_BASE
 QT.network.includes = $$QT_MODULE_INCLUDE_BASE/QtNetwork
-QT.network.private_includes = $$QT_MODULE_INCLUDE_BASE/QtNetwork/private
+QT.network.private_includes = $$QT_MODULE_INCLUDE_BASE/QtNetwork/$$QT.network.VERSION
 QT.network.sources = $$QT_MODULE_BASE/src/network
 QT.network.libs = $$QT_MODULE_LIB_BASE
 QT.network.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_opengl.pri b/src/modules/qt_opengl.pri
index 4d9a7029eff..b767a3ce124 100644
--- a/src/modules/qt_opengl.pri
+++ b/src/modules/qt_opengl.pri
@@ -1,12 +1,12 @@
-QT_OPENGL_VERSION = $$QT_VERSION
-QT_OPENGL_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_OPENGL_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_OPENGL_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.opengl.VERSION = 4.8.0
+QT.opengl.MAJOR_VERSION = 4
+QT.opengl.MINOR_VERSION = 8
+QT.opengl.PATCH_VERSION = 0
 
 QT.opengl.name = QtOpenGL
 QT.opengl.bins = $$QT_MODULE_BIN_BASE
 QT.opengl.includes = $$QT_MODULE_INCLUDE_BASE/QtOpenGL
-QT.opengl.private_includes = $$QT_MODULE_INCLUDE_BASE/QtOpenGL/private
+QT.opengl.private_includes = $$QT_MODULE_INCLUDE_BASE/QtOpenGL/$$QT.opengl.VERSION
 QT.opengl.sources = $$QT_MODULE_BASE/src/opengl
 QT.opengl.libs = $$QT_MODULE_LIB_BASE
 QT.opengl.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_openvg.pri b/src/modules/qt_openvg.pri
index 1261fd99c27..2ff477c013e 100644
--- a/src/modules/qt_openvg.pri
+++ b/src/modules/qt_openvg.pri
@@ -1,12 +1,12 @@
-QT_OPENVG_VERSION = $$QT_VERSION
-QT_OPENVG_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_OPENVG_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_OPENVG_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.openvg.VERSION = 4.8.0
+QT.openvg.MAJOR_VERSION = 4
+QT.openvg.MINOR_VERSION = 8
+QT.openvg.PATCH_VERSION = 0
 
 QT.openvg.name = QtOpenVG
 QT.openvg.bins = $$QT_MODULE_BIN_BASE
 QT.openvg.includes = $$QT_MODULE_INCLUDE_BASE/QtOpenVG
-QT.openvg.private_includes = $$QT_MODULE_INCLUDE_BASE/QtOpenVG/private
+QT.openvg.private_includes = $$QT_MODULE_INCLUDE_BASE/QtOpenVG/$$QT.openvg.VERSION
 QT.openvg.sources = $$QT_MODULE_BASE/src/openvg
 QT.openvg.libs = $$QT_MODULE_LIB_BASE
 QT.openvg.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_sql.pri b/src/modules/qt_sql.pri
index e7ca42a5134..14d2422989f 100644
--- a/src/modules/qt_sql.pri
+++ b/src/modules/qt_sql.pri
@@ -1,12 +1,12 @@
-QT_SQL_VERSION = $$QT_VERSION
-QT_SQL_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_SQL_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_SQL_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.sql.VERSION = 4.8.0
+QT.sql.MAJOR_VERSION = 4
+QT.sql.MINOR_VERSION = 8
+QT.sql.PATCH_VERSION = 0
 
 QT.sql.name = QtSql
 QT.sql.bins = $$QT_MODULE_BIN_BASE
 QT.sql.includes = $$QT_MODULE_INCLUDE_BASE/QtSql
-QT.sql.private_includes = $$QT_MODULE_INCLUDE_BASE/QtSql/private
+QT.sql.private_includes = $$QT_MODULE_INCLUDE_BASE/QtSql/$$QT.sql.VERSION
 QT.sql.sources = $$QT_MODULE_BASE/src/sql
 QT.sql.libs = $$QT_MODULE_LIB_BASE
 QT.sql.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_testlib.pri b/src/modules/qt_testlib.pri
index 6ef7939164a..9fd9b2e446f 100644
--- a/src/modules/qt_testlib.pri
+++ b/src/modules/qt_testlib.pri
@@ -1,12 +1,12 @@
-QT_TEST_VERSION = $$QT_VERSION
-QT_TEST_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_TEST_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_TEST_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.testlib.VERSION = 4.8.0
+QT.testlib.MAJOR_VERSION = 4
+QT.testlib.MINOR_VERSION = 8
+QT.testlib.PATCH_VERSION = 0
 
 QT.testlib.name = QtTest
 QT.testlib.bins = $$QT_MODULE_BIN_BASE
 QT.testlib.includes = $$QT_MODULE_INCLUDE_BASE/QtTest
-QT.testlib.private_includes = $$QT_MODULE_INCLUDE_BASE/QtTest/private
+QT.testlib.private_includes = $$QT_MODULE_INCLUDE_BASE/QtTest/$$QT.testlib.VERSION
 QT.testlib.sources = $$QT_MODULE_BASE/src/testlib
 QT.testlib.libs = $$QT_MODULE_LIB_BASE
 QT.testlib.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_uilib.pri b/src/modules/qt_uilib.pri
index 7e1dc7ccd23..5973216921e 100644
--- a/src/modules/qt_uilib.pri
+++ b/src/modules/qt_uilib.pri
@@ -1,14 +1,13 @@
-QT_UILIB_VERSION = $$QT_VERSION
-QT_UILIB_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_UILIB_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_UILIB_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.uilib.VERSION = 4.8.0
+QT.uilib.MAJOR_VERSION = 4
+QT.uilib.MINOR_VERSION = 8
+QT.uilib.PATCH_VERSION = 0
 
-QT.uilib.name =
+QT.uilib.name = QtUiLib
 QT.uilib.bins = $$QT_MODULE_BIN_BASE
 QT.uilib.includes = $$QT_MODULE_INCLUDE_BASE/QtDesigner
-QT.uilib.private_includes = $$QT_MODULE_INCLUDE_BASE/QtDesigner/private
+QT.uilib.private_includes = $$QT_MODULE_INCLUDE_BASE/QtDesigner/$$QT.uilib.VERSION
 QT.uilib.sources = $$QT_MODULE_BASE/tools/uilib
-QT.uilib.libs = $$QT_MODULE_LIB_BASE
 QT.uilib.plugins = $$QT_MODULE_PLUGIN_BASE
 QT.uilib.imports = $$QT_MODULE_IMPORT_BASE
 QT.uilib.depends = xml
diff --git a/src/modules/qt_uitools.pri b/src/modules/qt_uitools.pri
index d2210076841..d30c8b845b2 100644
--- a/src/modules/qt_uitools.pri
+++ b/src/modules/qt_uitools.pri
@@ -1,12 +1,12 @@
-QT_UITOOLS_VERSION = $$QT_VERSION
-QT_UITOOLS_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_UITOOLS_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_UITOOLS_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.uitools.VERSION = 4.8.0
+QT.uitools.MAJOR_VERSION = 4
+QT.uitools.MINOR_VERSION = 8
+QT.uitools.PATCH_VERSION = 0
 
 QT.uitools.name = QtUiTools
 QT.uitools.bins = $$QT_MODULE_BIN_BASE
 QT.uitools.includes = $$QT_MODULE_INCLUDE_BASE/QtUiTools
-QT.uitools.private_includes = $$QT_MODULE_INCLUDE_BASE/QtUiTools/private
+QT.uitools.private_includes = $$QT_MODULE_INCLUDE_BASE/QtUiTools/$$QT.uitools.VERSION
 QT.uitools.sources = $$QT_MODULE_BASE/src/uitools
 QT.uitools.libs = $$QT_MODULE_LIB_BASE
 QT.uitools.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/modules/qt_xml.pri b/src/modules/qt_xml.pri
index 0ede3d2ddf0..e7db6365eb8 100644
--- a/src/modules/qt_xml.pri
+++ b/src/modules/qt_xml.pri
@@ -1,12 +1,12 @@
-QT_XML_VERSION = $$QT_VERSION
-QT_XML_MAJOR_VERSION = $$QT_MAJOR_VERSION
-QT_XML_MINOR_VERSION = $$QT_MINOR_VERSION
-QT_XML_PATCH_VERSION = $$QT_PATCH_VERSION
+QT.xml.VERSION = 4.8.0
+QT.xml.MAJOR_VERSION = 4
+QT.xml.MINOR_VERSION = 8
+QT.xml.PATCH_VERSION = 0
 
 QT.xml.name = QtXml
 QT.xml.bins = $$QT_MODULE_BIN_BASE
 QT.xml.includes = $$QT_MODULE_INCLUDE_BASE/QtXml
-QT.xml.private_includes = $$QT_MODULE_INCLUDE_BASE/QtXml/private
+QT.xml.private_includes = $$QT_MODULE_INCLUDE_BASE/QtXml/$$QT.xml.VERSION
 QT.xml.sources = $$QT_MODULE_BASE/src/xml
 QT.xml.libs = $$QT_MODULE_LIB_BASE
 QT.xml.plugins = $$QT_MODULE_PLUGIN_BASE
diff --git a/src/network/network.pro b/src/network/network.pro
index 153961762ae..fc5d08d936e 100644
--- a/src/network/network.pro
+++ b/src/network/network.pro
@@ -13,7 +13,7 @@ DEFINES += QT_BUILD_NETWORK_LIB QT_NO_USING_NAMESPACE
 #DEFINES += QABSTRACTSOCKET_DEBUG QNATIVESOCKETENGINE_DEBUG
 #DEFINES += QTCPSOCKETENGINE_DEBUG QTCPSOCKET_DEBUG QTCPSERVER_DEBUG QSSLSOCKET_DEBUG
 #DEFINES += QUDPSOCKET_DEBUG QUDPSERVER_DEBUG
-QT = core
+QT = core-private
 win32-msvc*|win32-icc:QMAKE_LFLAGS += /BASE:0x64000000
 
 unix|win32-g++*:QMAKE_PKGCONFIG_REQUIRES = QtCore
diff --git a/src/opengl/opengl.pro b/src/opengl/opengl.pro
index 24dbb7aa3e7..849bd9ebc7d 100644
--- a/src/opengl/opengl.pro
+++ b/src/opengl/opengl.pro
@@ -1,6 +1,6 @@
 TARGET     = QtOpenGL
 QPRO_PWD   = $$PWD
-QT         = core gui
+QT         = core-private gui-private
 
 CONFIG += module
 MODULE_PRI = ../modules/qt_opengl.pri
diff --git a/src/plugins/accessible/widgets/widgets.pro b/src/plugins/accessible/widgets/widgets.pro
index 092f3ca32ce..8329bce963d 100644
--- a/src/plugins/accessible/widgets/widgets.pro
+++ b/src/plugins/accessible/widgets/widgets.pro
@@ -2,6 +2,7 @@ TARGET  = qtaccessiblewidgets
 include(../../qpluginbase.pri)
 include (../qaccessiblebase.pri)
 
+QT += core-private gui-private
 DESTDIR = $$QT.gui.plugins/accessible
 
 QTDIR_build:REQUIRES += "contains(QT_CONFIG, accessibility)"
diff --git a/src/plugins/bearer/connman/connman.pro b/src/plugins/bearer/connman/connman.pro
index 3ac54c37699..f57a0c930bd 100644
--- a/src/plugins/bearer/connman/connman.pro
+++ b/src/plugins/bearer/connman/connman.pro
@@ -1,7 +1,7 @@
 TARGET = qconnmanbearer
 include(../../qpluginbase.pri)
 
-QT = core network dbus
+QT = core network-private dbus
 
 HEADERS += qconnmanservice_linux_p.h \
            qofonoservice_linux_p.h \
diff --git a/src/plugins/bearer/generic/generic.pro b/src/plugins/bearer/generic/generic.pro
index 94ab36ce59a..94fefaf6c29 100644
--- a/src/plugins/bearer/generic/generic.pro
+++ b/src/plugins/bearer/generic/generic.pro
@@ -1,7 +1,7 @@
 TARGET = qgenericbearer
 include(../../qpluginbase.pri)
 
-QT = core network
+QT = core-private network-private
 
 HEADERS += qgenericengine.h \
            ../qnetworksession_impl.h \
diff --git a/src/plugins/bearer/nativewifi/nativewifi.pro b/src/plugins/bearer/nativewifi/nativewifi.pro
index 6df346cd46d..ba02f37d23f 100644
--- a/src/plugins/bearer/nativewifi/nativewifi.pro
+++ b/src/plugins/bearer/nativewifi/nativewifi.pro
@@ -1,7 +1,7 @@
 TARGET = qnativewifibearer
 include(../../qpluginbase.pri)
 
-QT = core network
+QT = core-private network-private
 
 HEADERS += qnativewifiengine.h \
            platformdefs.h \
diff --git a/src/plugins/bearer/networkmanager/networkmanager.pro b/src/plugins/bearer/networkmanager/networkmanager.pro
index b3e088344df..a9de1561fdc 100644
--- a/src/plugins/bearer/networkmanager/networkmanager.pro
+++ b/src/plugins/bearer/networkmanager/networkmanager.pro
@@ -1,7 +1,7 @@
 TARGET = qnmbearer
 include(../../qpluginbase.pri)
 
-QT = core network dbus
+QT = core network-private dbus
 
 HEADERS += qnmdbushelper.h \
            qnetworkmanagerservice.h \
diff --git a/src/plugins/graphicssystems/opengl/opengl.pro b/src/plugins/graphicssystems/opengl/opengl.pro
index fb3cb5331ad..30c88271b69 100644
--- a/src/plugins/graphicssystems/opengl/opengl.pro
+++ b/src/plugins/graphicssystems/opengl/opengl.pro
@@ -1,7 +1,7 @@
 TARGET = qglgraphicssystem
 include(../../qpluginbase.pri)
 
-QT += opengl
+QT += core-private gui-private opengl-private
 
 DESTDIR = $$QT.gui.plugins/graphicssystems
 
diff --git a/src/plugins/graphicssystems/trace/trace.pro b/src/plugins/graphicssystems/trace/trace.pro
index 0958a86973d..b31beb35f82 100644
--- a/src/plugins/graphicssystems/trace/trace.pro
+++ b/src/plugins/graphicssystems/trace/trace.pro
@@ -1,7 +1,7 @@
 TARGET = qtracegraphicssystem
 include(../../qpluginbase.pri)
 
-QT += network
+QT += core-private gui-private network
 
 DESTDIR = $$QT.gui.plugins/graphicssystems
 symbian:TARGET.UID3 = 0x2002130E
diff --git a/src/plugins/imageformats/jpeg/jpeg.pro b/src/plugins/imageformats/jpeg/jpeg.pro
index 3a0e8754c06..1e6c24d061c 100644
--- a/src/plugins/imageformats/jpeg/jpeg.pro
+++ b/src/plugins/imageformats/jpeg/jpeg.pro
@@ -1,6 +1,8 @@
 TARGET  = qjpeg
 include(../../qpluginbase.pri)
 
+QT += core-private
+
 QTDIR_build:REQUIRES = "!contains(QT_CONFIG, no-jpeg)"
 
 include(../../../gui/image/qjpeghandler.pri)
diff --git a/src/plugins/sqldrivers/qsqldriverbase.pri b/src/plugins/sqldrivers/qsqldriverbase.pri
index 64f55fda785..7399c659da1 100644
--- a/src/plugins/sqldrivers/qsqldriverbase.pri
+++ b/src/plugins/sqldrivers/qsqldriverbase.pri
@@ -1,5 +1,5 @@
 include(../qpluginbase.pri)
-QT  = core sql
+QT  = core sql-private
 DESTDIR = $$QT.sql.plugins/sqldrivers
 
 target.path     += $$[QT_INSTALL_PLUGINS]/sqldrivers
diff --git a/src/qbase.pri b/src/qbase.pri
index 4ff17630c5e..6336aa9f5c1 100644
--- a/src/qbase.pri
+++ b/src/qbase.pri
@@ -4,6 +4,9 @@ isEmpty(MODULE):MODULE = $$section($$list($$basename(_PRO_FILE_)), ., 0, 0)
 isEmpty(TARGET):error("You must set TARGET before include()'ing $${_FILE_}")
 
 MODULE_INCLUDES = $$eval(QT.$${MODULE}.includes)
+MODULE_PRIVATE_INCLUDES = $$eval(QT.$${MODULE}.private_includes)
+INCLUDEPATH *= $$MODULE_PRIVATE_INCLUDES
+INCLUDEPATH *= $$MODULE_PRIVATE_INCLUDES/$$TARGET
 INCLUDEPATH *= $$MODULE_INCLUDES $$MODULE_INCLUDES/.. #just for today to have some compat
 !isEmpty(RCC_DIR): INCLUDEPATH += $$RCC_DIR
 isEmpty(QT_ARCH):!isEmpty(ARCH):QT_ARCH=$$ARCH #another compat that will rot for change #215700
diff --git a/src/qt_install.pri b/src/qt_install.pri
index 268bb864f6a..17b41af1ce5 100644
--- a/src/qt_install.pri
+++ b/src/qt_install.pri
@@ -31,11 +31,9 @@ qt_install_headers {
     targ_headers.path = $$[QT_INSTALL_HEADERS]/$$TARGET
     INSTALLS += targ_headers
 
-    contains(QT_CONFIG,private_tests) {
-        private_headers.files = $$SYNCQT.PRIVATE_HEADER_FILES
-        private_headers.path = $$[QT_INSTALL_HEADERS]/$$TARGET/private
-        INSTALLS += private_headers
-    }
+    private_headers.files = $$SYNCQT.PRIVATE_HEADER_FILES
+    private_headers.path = $$[QT_INSTALL_HEADERS]/$$TARGET/$$eval(QT.$${MODULE}.VERSION)/private
+    INSTALLS += private_headers
 }
 
 embedded|qpa: equals(TARGET, QtGui) {
diff --git a/src/sql/sql.pro b/src/sql/sql.pro
index 550b24b754f..f1bdd6bda1a 100644
--- a/src/sql/sql.pro
+++ b/src/sql/sql.pro
@@ -1,6 +1,6 @@
 TARGET	   = QtSql
 QPRO_PWD   = $$PWD
-QT         = core
+QT         = core-private
 
 CONFIG += module
 MODULE_PRI = ../modules/qt_sql.pri
diff --git a/src/tools/bootstrap/bootstrap.pri b/src/tools/bootstrap/bootstrap.pri
index f48c8c12fff..50c1af1775e 100644
--- a/src/tools/bootstrap/bootstrap.pri
+++ b/src/tools/bootstrap/bootstrap.pri
@@ -29,7 +29,11 @@ win32:DEFINES += QT_NODLL
 
 INCLUDEPATH	+= $$QT_BUILD_TREE/include \
                    $$QT_BUILD_TREE/include/QtCore \
+                   $$QT_BUILD_TREE/include/QtCore/$$QT.core.VERSION \
+                   $$QT_BUILD_TREE/include/QtCore/$$QT.core.VERSION/QtCore \
                    $$QT_BUILD_TREE/include/QtXml \
+                   $$QT_BUILD_TREE/include/QtXml/$$QT.xml.VERSION \
+                   $$QT_BUILD_TREE/include/QtXml/$$QT.xml.VERSION/QtXml \
                    $$QT_SOURCE_TREE/src/xml
 DEPENDPATH	+= $$INCLUDEPATH \
                    $$QT_SOURCE_TREE/src/corelib/global \
diff --git a/src/tools/bootstrap/bootstrap.pro b/src/tools/bootstrap/bootstrap.pro
index 50ae2cff161..6ff948c8e8e 100644
--- a/src/tools/bootstrap/bootstrap.pro
+++ b/src/tools/bootstrap/bootstrap.pro
@@ -32,7 +32,11 @@ win32:DEFINES += QT_NODLL
 
 INCLUDEPATH += $$QT_BUILD_TREE/include \
             $$QT_BUILD_TREE/include/QtCore \
-            $$QT_BUILD_TREE/include/QtXml
+            $$QT_BUILD_TREE/include/QtCore/$$QT.core.VERSION \
+            $$QT_BUILD_TREE/include/QtCore/$$QT.core.VERSION/QtCore \
+            $$QT_BUILD_TREE/include/QtXml \
+            $$QT_BUILD_TREE/include/QtXml/$$QT.xml.VERSION \
+            $$QT_BUILD_TREE/include/QtXml/$$QT.xml.VERSION/QtXml \
 
 DEPENDPATH += $$INCLUDEPATH \
               ../../corelib/global \
diff --git a/src/xml/xml.pro b/src/xml/xml.pro
index e6fce60371d..68bb20b0098 100644
--- a/src/xml/xml.pro
+++ b/src/xml/xml.pro
@@ -1,6 +1,6 @@
 TARGET     = QtXml
 QPRO_PWD   = $$PWD
-QT         = core
+QT         = core-private
 
 CONFIG += module
 MODULE_PRI = ../modules/qt_xml.pri
diff --git a/tools/configure/configure.pro b/tools/configure/configure.pro
index 124564667c5..81458fc1bda 100644
--- a/tools/configure/configure.pro
+++ b/tools/configure/configure.pro
@@ -28,6 +28,8 @@ INCLUDEPATH += \
            $$QT_SOURCE_TREE/src/corelib/global \
            $$QT_BUILD_TREE/include \
            $$QT_BUILD_TREE/include/QtCore \
+           $$QT_BUILD_TREE/include/QtCore/$$QT.core.VERSION \
+           $$QT_BUILD_TREE/include/QtCore/$$QT.core.VERSION/QtCore \
            $$QT_SOURCE_TREE/tools/shared
 
 HEADERS  = configureapp.h environment.h tools.h\
diff --git a/tools/configure/configureapp.cpp b/tools/configure/configureapp.cpp
index 9c2ce2cfb40..3f9d97c1ac6 100644
--- a/tools/configure/configureapp.cpp
+++ b/tools/configure/configureapp.cpp
@@ -2913,7 +2913,7 @@ void Configure::generateCachefile()
         for (QStringList::Iterator var = qmakeVars.begin(); var != qmakeVars.end(); ++var) {
             cacheStream << (*var) << endl;
         }
-        cacheStream << "CONFIG         += " << qmakeConfig.join(" ") << " incremental msvc_mp create_prl link_prl depend_includepath QTDIR_build" << endl;
+        cacheStream << "CONFIG         += " << qmakeConfig.join(" ") << " incremental msvc_mp create_prl link_prl depend_includepath no_private_qt_headers_warning QTDIR_build" << endl;
 
         cacheStream.flush();
         cacheFile.close();
@@ -3648,7 +3648,8 @@ void Configure::buildQmake()
                 stream << "#AutoGenerated by configure.exe" << endl
                     << "BUILD_PATH = " << QDir::convertSeparators(buildPath) << endl
                     << "SOURCE_PATH = " << QDir::convertSeparators(sourcePath) << endl;
-                stream << "QMAKESPEC = " << dictionary["QMAKESPEC"] << endl;
+                stream << "QMAKESPEC = " << dictionary["QMAKESPEC"] << endl
+                       << "QT_VERSION = " << QT_VERSION_STR << endl;
 
                 if (dictionary["EDITION"] == "OpenSource" ||
                     dictionary["QT_EDITION"].contains("OPENSOURCE"))