diff --git a/qt5-qtbase.spec b/qt5-qtbase.spec
index 5eb047c..f4664c3 100644
--- a/qt5-qtbase.spec
+++ b/qt5-qtbase.spec
@@ -46,7 +46,7 @@ BuildRequires: pkgconfig(libsystemd)
 Name:    qt5-qtbase
 Summary: Qt5 - QtBase components
 Version: 5.11.3
-Release: 1%{?dist}
+Release: 2%{?dist}
 
 # See LGPL_EXCEPTIONS.txt, for exception details
 License: LGPLv2 with exceptions or GPLv3 with exceptions
@@ -95,6 +95,10 @@ Patch51: qtbase-hidpi_scale_at_192.patch
 # 2. Workaround sysmacros.h (pre)defining major/minor a breaking stuff
 Patch52: qtbase-opensource-src-5.7.1-moc_macros.patch
 
+# CMake generates wrong -isystem /usr/include compilations flags with Qt5::Gui
+# https://bugzilla.redhat.com/1704474
+Patch53: qtbase-everywhere-src-5.12.1-qt5gui_cmake_isystem_includes.patch
+
 # respect QMAKE_LFLAGS_RELEASE when building qmake
 Patch54: qtbase-qmake_LFLAGS.patch
 
@@ -358,11 +362,13 @@ Qt5 libraries used for drawing widgets and OpenGL items.
 
 
 %patch4 -p1 -b .QTBUG-35459
-%patch8 -p1 -b .tell-the-truth-about-private-api
+# omit '-b .tell-the-truth-about-private-api' so it doesn't end up in installed files -- rdieter
+%patch8 -p1
 
 %patch50 -p1 -b .QT_VERSION_CHECK
 %patch51 -p1 -b .hidpi_scale_at_192
 %patch52 -p1 -b .moc_macros
+%patch53 -p1 -b .qt5gui_cmake_isystem_includes
 %patch54 -p1 -b .qmake_LFLAGS
 %patch61 -p1 -b .qt5-qtbase-cxxflag
 %patch64 -p1 -b .firebird
@@ -984,6 +990,9 @@ fi
 
 
 %changelog
+* Tue Apr 30 2019 Rex Dieter <rdieter@fedoraproject.org> - 5.11.3-2
+- (branch) CMake generates wrong -isystem /usr/include compilations flags with Qt5::Gui (#1704474)
+
 * Fri Dec 07 2018 Rex Dieter <rdieter@fedoraproject.org> - 5.11.3-1
 - 5.11.3
 
diff --git a/qtbase-everywhere-src-5.12.1-qt5gui_cmake_isystem_includes.patch b/qtbase-everywhere-src-5.12.1-qt5gui_cmake_isystem_includes.patch
new file mode 100644
index 0000000..ff00e63
--- /dev/null
+++ b/qtbase-everywhere-src-5.12.1-qt5gui_cmake_isystem_includes.patch
@@ -0,0 +1,14 @@
+diff -up qtbase-everywhere-src-5.12.1/src/gui/Qt5GuiConfigExtras.cmake.in.foo qtbase-everywhere-src-5.12.1/src/gui/Qt5GuiConfigExtras.cmake.in
+--- qtbase-everywhere-src-5.12.1/src/gui/Qt5GuiConfigExtras.cmake.in.foo	2019-04-30 15:18:24.886346423 -0500
++++ qtbase-everywhere-src-5.12.1/src/gui/Qt5GuiConfigExtras.cmake.in	2019-04-30 15:19:48.303873296 -0500
+@@ -66,8 +66,10 @@ unset(_GL_INCDIRS)
+ # Don\'t check for existence of the "_qt5gui_OPENGL_INCLUDE_DIR" because it is
+ # optional.
+ 
++if (NOT ${_qt5gui_OPENGL_INCLUDE_DIR} STREQUAL "/usr/include")
+ list(APPEND Qt5Gui_INCLUDE_DIRS ${_qt5gui_OPENGL_INCLUDE_DIR})
+ set_property(TARGET Qt5::Gui APPEND PROPERTY INTERFACE_INCLUDE_DIRECTORIES ${_qt5gui_OPENGL_INCLUDE_DIR})
++endif()
+ 
+ unset(_qt5gui_OPENGL_INCLUDE_DIR CACHE)
+