diff --git a/build/aclocal/bakefile.m4 b/build/aclocal/bakefile.m4
index efa98ae0d0..c45c736cc1 100644
--- a/build/aclocal/bakefile.m4
+++ b/build/aclocal/bakefile.m4
@@ -377,7 +377,7 @@ AC_DEFUN([AC_BAKEFILE_SHARED_LD],
         fi
       ;;
 
-      *-*-cygwin* | *-*-mingw32* )
+      *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
         PIC_FLAG=""
         SHARED_LD_CC="\$(CC) -shared -o"
         SHARED_LD_CXX="\$(CXX) -shared -o"
@@ -578,7 +578,7 @@ AC_DEFUN([AC_BAKEFILE_CHECK_BASIC_STUFF],
 
     LDFLAGS_GUI=
     case ${BAKEFILE_HOST} in
-        *-*-cygwin* | *-*-mingw32* )
+        *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
         LDFLAGS_GUI="-mwindows"
     esac
     AC_SUBST(LDFLAGS_GUI)
@@ -594,7 +594,7 @@ dnl ---------------------------------------------------------------------------
 AC_DEFUN([AC_BAKEFILE_RES_COMPILERS],
 [
     case ${BAKEFILE_HOST} in
-        *-*-cygwin* | *-*-mingw32* )
+        *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
             dnl Check for win32 resources compiler:
             AC_CHECK_TOOL(WINDRES, windres)
          ;;
diff --git a/configure b/configure
index 42edeae0c8..1b11ac5dc3 100755
--- a/configure
+++ b/configure
@@ -1040,6 +1040,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -1460,6 +1461,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1712,6 +1714,15 @@ 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=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1849,7 +1860,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -2002,6 +2013,7 @@ 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]
@@ -3991,7 +4003,7 @@ case "${host}" in
 
   ;;
 
-  *-*-cygwin* | *-*-mingw32* )
+  *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
                 PROGRAM_EXT=".exe"
     DEFAULT_DEFAULT_wxUSE_MSW=1
   ;;
@@ -27002,6 +27014,20 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
 
 
     if test "$wxUSE_QT" = 1; then
+        TOOLKIT=QT
+        GUIDIST=QT_DIST
+        TOOLKIT_DIR="qt"
+
+        if test -n "$QT5_CUSTOM_DIR" ; then
+                        TOOLKIT_INCLUDE="${TOOLKIT_INCLUDE} -I${QT5_CUSTOM_DIR}/include"
+            GUI_TK_LIBRARY="${GUI_TK_LIBRARY} -L${QT5_CUSTOM_DIR}/lib \
+                            -lQt5Core -lQt5Widgets -lQt5Gui -lQt5OpenGL -lQt5Test \
+                            -Wl,-rpath,${QT5_CUSTOM_DIR}/lib"
+
+        elif test -z "$PKG_CONFIG" ; then
+            as_fn_error $? "specify QT5_CUSTOM_DIR or make sure pkg-config is available to search for Qt5 libraries" "$LINENO" 5
+
+        else
 
 pkg_failed=no
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for QT5" >&5
@@ -27062,12 +27088,12 @@ fi
 	echo "$QT5_PKG_ERRORS" >&5
 
 
-                as_fn_error $? "Qt5 libraries are not available" "$LINENO" 5
+                    as_fn_error $? "Qt5 libraries are not available" "$LINENO" 5
 
 
 elif test $pkg_failed = untried; then
 
-                as_fn_error $? "Qt5 libraries are not available" "$LINENO" 5
+                    as_fn_error $? "Qt5 libraries are not available" "$LINENO" 5
 
 
 else
@@ -27076,9 +27102,6 @@ else
         { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
 
-                TOOLKIT=QT
-                GUIDIST=QT_DIST
-                TOOLKIT_DIR="qt"
                 TOOLKIT_INCLUDE="${TOOLKIT_INCLUDE} ${QT5_CFLAGS}"
                 GUI_TK_LIBRARY="${GUI_TK_LIBRARY} ${QT5_LIBS}"
                 if `pkg-config --variable qt_config Qt5Core | grep "reduce_relocations" >/dev/null`; then
@@ -27087,6 +27110,7 @@ $as_echo "yes" >&6; }
                 fi
 
 fi
+        fi
     fi
         TOOLKIT_DIR=`echo ${TOOLKIT} | tr '[A-Z]' '[a-z]'`
 
@@ -29855,7 +29879,7 @@ EOF
                                         HEADER_PAD_OPTION="-headerpad_max_install_names"
       ;;
 
-      *-*-cygwin* | *-*-mingw32* )
+      *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
         ;;
 
       *-*-hpux* )
@@ -39632,7 +39656,7 @@ fi
 
     LDFLAGS_GUI=
     case ${BAKEFILE_HOST} in
-        *-*-cygwin* | *-*-mingw32* )
+        *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
         LDFLAGS_GUI="-mwindows"
     esac
 
@@ -40066,7 +40090,7 @@ fi
         fi
       ;;
 
-      *-*-cygwin* | *-*-mingw32* )
+      *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
         PIC_FLAG=""
         SHARED_LD_CC="\$(CC) -shared -o"
         SHARED_LD_CXX="\$(CXX) -shared -o"
@@ -40311,7 +40335,7 @@ EOF
 
 
     case ${BAKEFILE_HOST} in
-        *-*-cygwin* | *-*-mingw32* )
+        *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
                         if test -n "$ac_tool_prefix"; then
   # Extract the first word of "${ac_tool_prefix}windres", so it can be a program name with args.
 set dummy ${ac_tool_prefix}windres; ac_word=$2
diff --git a/configure.in b/configure.in
index e0f500ce93..cbd7392216 100644
--- a/configure.in
+++ b/configure.in
@@ -262,7 +262,7 @@ case "${host}" in
     AC_DEFINE(__UNIXWARE__)
   ;;
 
-  *-*-cygwin* | *-*-mingw32* )
+  *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
     dnl MBN: some of the defines have been moved after toolkit detection
     dnl      because for wxMotif/wxGTK/wxX11 to build on Cygwin
     dnl      USE_UNIX  must be set and not USE_WIN32
@@ -3361,12 +3361,24 @@ libraries returned by 'pkg-config gtk+-2.0 --libs' or 'gtk-config
 
 
     if test "$wxUSE_QT" = 1; then
-        PKG_CHECK_MODULES(QT5,
+        TOOLKIT=QT
+        GUIDIST=QT_DIST
+        TOOLKIT_DIR="qt"
+
+        if test -n "$QT5_CUSTOM_DIR" ; then
+            dnl the name of the directory where the files for this toolkit live
+            TOOLKIT_INCLUDE="${TOOLKIT_INCLUDE} -I${QT5_CUSTOM_DIR}/include"
+            GUI_TK_LIBRARY="${GUI_TK_LIBRARY} -L${QT5_CUSTOM_DIR}/lib \
+                            -lQt5Core -lQt5Widgets -lQt5Gui -lQt5OpenGL -lQt5Test \
+                            -Wl,-rpath,${QT5_CUSTOM_DIR}/lib"
+
+        elif test -z "$PKG_CONFIG" ; then
+            AC_MSG_ERROR([specify QT5_CUSTOM_DIR or make sure pkg-config is available to search for Qt5 libraries])
+
+        else
+            PKG_CHECK_MODULES(QT5,
                           [Qt5Core Qt5Widgets Qt5Gui Qt5OpenGL Qt5Test],
-            [
-                TOOLKIT=QT
-                GUIDIST=QT_DIST
-                TOOLKIT_DIR="qt"
+                [
                 TOOLKIT_INCLUDE="${TOOLKIT_INCLUDE} ${QT5_CFLAGS}"
                 GUI_TK_LIBRARY="${GUI_TK_LIBRARY} ${QT5_LIBS}"
                 if `pkg-config --variable qt_config Qt5Core | grep "reduce_relocations" >/dev/null`; then
@@ -3374,11 +3386,12 @@ libraries returned by 'pkg-config gtk+-2.0 --libs' or 'gtk-config
                     SAMPLES_CXXFLAGS="-fPIC $SAMPLES_CXXFLAGS"
                     WXCONFIG_CXXFLAGS="-fPIC $WXCONFIG_CXXFLAGS"
                 fi
-            ],
-            [
-                AC_MSG_ERROR([Qt5 libraries are not available])
-            ]
-        )
+                ],
+                [
+                    AC_MSG_ERROR([Qt5 libraries are not available])
+                ]
+            )
+        fi
     fi
     dnl the name of the directory where the files for this toolkit live
     TOOLKIT_DIR=`echo ${TOOLKIT} | tr '[[A-Z]]' '[[a-z]]'`
@@ -3699,7 +3712,7 @@ EOF
         HEADER_PAD_OPTION="-headerpad_max_install_names"
       ;;
 
-      *-*-cygwin* | *-*-mingw32* )
+      *-*-cygwin* | *-*-mingw32* | *-*-mingw64* )
         ;;
 
       *-*-hpux* )
diff --git a/docs/qt/install.txt b/docs/qt/install.txt
index 3bed60b9a5..c3868ab6c7 100644
--- a/docs/qt/install.txt
+++ b/docs/qt/install.txt
@@ -91,6 +91,21 @@ cd tests
 make
 ./test_gui
 
+* Building wxQT, using qt-unified-XXX-online installer
+------------------------------------------------------
+
+Download qt-unified-XXX-online installer from the qt website.
+Install the Qt package of your choice (with the same minimum version
+restriction as above).
+The same build instructions apply, except that you need to explicitly pass
+to configure the Qt dir of the build intended to use as QT5_CUSTOM_DIR, i.e.
+
+# for Linux:
+../configure --with-qt --enable-debug QT5_CUSTOM_DIR=~/Qt/5.11.0/gcc_64
+
+# for Windows (ran from Git Bash, or any other Unix-like shell):
+../configure --with-qt --enable-debug QT5_CUSTOM_DIR=/c/Qt/5.11.0/mingw53_32
+
 * Building wxGT on Android
 --------------------------
 
diff --git a/include/wx/chkconf.h b/include/wx/chkconf.h
index 106918e031..586680b307 100644
--- a/include/wx/chkconf.h
+++ b/include/wx/chkconf.h
@@ -1721,6 +1721,11 @@
 #   endif
 #endif
 
+#if wxUSE_ACTIVITYINDICATOR && !wxUSE_GRAPHICS_CONTEXT
+#   undef wxUSE_ACTIVITYINDICATOR
+#   define wxUSE_ACTIVITYINDICATOR 0
+#endif /* wxUSE_ACTIVITYINDICATOR */
+
 #if wxUSE_GRAPHICS_CONTEXT && !wxUSE_GEOMETRY
 #   ifdef wxABORT_ON_CONFIG_ERROR
 #       error "wxUSE_GRAPHICS_CONTEXT requires wxUSE_GEOMETRY"
@@ -1737,7 +1742,7 @@
 #       undef wxUSE_DC_TRANSFORM_MATRIX
 #       define wxUSE_DC_TRANSFORM_MATRIX 0
 #   endif
-#endif /* wxUSE_GRAPHICS_CONTEXT */
+#endif /* wxUSE_DC_TRANSFORM_MATRIX */
 
 /* generic controls dependencies */
 #if !defined(__WXMSW__) || defined(__WXUNIVERSAL__)
diff --git a/src/common/utilscmn.cpp b/src/common/utilscmn.cpp
index 6000660563..729c51da67 100644
--- a/src/common/utilscmn.cpp
+++ b/src/common/utilscmn.cpp
@@ -108,7 +108,7 @@
 #endif
 
 #if wxUSE_GUI && defined(__WXQT__)
-    #include <QtGlobal>       // for QT_VERSION_STR constants
+    #include <QtCore/QtGlobal>       // for QT_VERSION_STR constants
 #endif
 #if wxUSE_BASE
 
diff --git a/src/qt/apptraits.cpp b/src/qt/apptraits.cpp
index f196158be2..1f1553f6c0 100644
--- a/src/qt/apptraits.cpp
+++ b/src/qt/apptraits.cpp
@@ -15,7 +15,7 @@
 #include "wx/timer.h"
 #include "wx/qt/private/timer.h"
 
-#include <QtGlobal>
+#include <QtCore/QtGlobal>
 
 wxEventLoopBase *wxGUIAppTraits::CreateEventLoop()
 {
diff --git a/src/qt/clipbrd.cpp b/src/qt/clipbrd.cpp
index d692f6627e..5a39a623c2 100644
--- a/src/qt/clipbrd.cpp
+++ b/src/qt/clipbrd.cpp
@@ -12,8 +12,8 @@
     #pragma hdrstop
 #endif
 
-#include <QApplication>
-#include <QClipboard>
+#include <QtWidgets/QApplication>
+#include <QtGui/QClipboard>
 
 #include "wx/clipbrd.h"
 #include "wx/scopedarray.h"
diff --git a/src/qt/cursor.cpp b/src/qt/cursor.cpp
index 442e250458..880a2799fa 100644
--- a/src/qt/cursor.cpp
+++ b/src/qt/cursor.cpp
@@ -12,8 +12,8 @@
     #pragma hdrstop
 #endif
 
-#include <QApplication>
-#include <QBitmap>
+#include <QtWidgets/QApplication>
+#include <QtGui/QBitmap>
 
 #ifndef WX_PRECOMP
     #include "wx/bitmap.h"
diff --git a/src/qt/dcscreen.cpp b/src/qt/dcscreen.cpp
index dd0e6f11b8..b42445ea3a 100644
--- a/src/qt/dcscreen.cpp
+++ b/src/qt/dcscreen.cpp
@@ -13,8 +13,8 @@
 
 #include <QtWidgets/QDesktopWidget>
 #include <QtGui/QScreen>
-#include <QApplication>
-#include <QPixmap>
+#include <QtWidgets/QApplication>
+#include <QtGui/QPixmap>
 
 wxIMPLEMENT_ABSTRACT_CLASS(wxScreenDCImpl, wxWindowDCImpl);
 
diff --git a/src/qt/listctrl.cpp b/src/qt/listctrl.cpp
index 7c9c9940cd..7ddd3b8d79 100644
--- a/src/qt/listctrl.cpp
+++ b/src/qt/listctrl.cpp
@@ -12,7 +12,7 @@
     #pragma hdrstop
 #endif
 
-#include <QHeaderView>
+#include <QtWidgets/QHeaderView>
 
 #ifndef WX_PRECOMP
     #include "wx/bitmap.h"
diff --git a/src/qt/toolbar.cpp b/src/qt/toolbar.cpp
index cad52f82cb..c6ec8adc5c 100644
--- a/src/qt/toolbar.cpp
+++ b/src/qt/toolbar.cpp
@@ -14,7 +14,7 @@
 
 #if wxUSE_TOOLBAR
 
-#include <QActionGroup>
+#include <QtWidgets/QActionGroup>
 #include <QtWidgets/QToolButton>
 
 #ifndef WX_PRECOMP
diff --git a/src/qt/uiaction.cpp b/src/qt/uiaction.cpp
index 6490cf35d9..0df9863b9c 100644
--- a/src/qt/uiaction.cpp
+++ b/src/qt/uiaction.cpp
@@ -16,8 +16,8 @@
 #include "wx/private/uiaction.h"
 
 #include <QtTest/QtTestGui>
-#include <QApplication>
-#include <QWidget>
+#include <QtWidgets/QApplication>
+#include <QtWidgets/QWidget>
 
 #include "wx/qt/defs.h"
 #include "wx/qt/private/utils.h"