From 90f7cf2fd024a5056b01df931a2765a8e8db4f58 Mon Sep 17 00:00:00 2001
From: Enrico Forestieri <forenr@lyx.org>
Date: Sun, 5 Mar 2017 00:14:53 +0100
Subject: [PATCH] Fix configuring for Qt 5.8

They moved the QT_QPA_DEFAULT_PLATFORM_NAME definition to the newly
introduced qtgui-config.h header.
---
 config/qt4.m4 | 7 +++++--
 status.22x    | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/config/qt4.m4 b/config/qt4.m4
index 93663712fc..ff8d68f6a5 100644
--- a/config/qt4.m4
+++ b/config/qt4.m4
@@ -180,10 +180,13 @@ AC_DEFUN([QT_DO_IT_ALL],
 
 	if test x$USE_QT5 = xyes ; then
 	  save_CPPFLAGS=$CPPFLAGS
-	  AC_MSG_CHECKING([whether Qt uses the X Window system])
 	  CPPFLAGS="$save_CPPFLAGS $QT_CORE_INCLUDES"
+	  AC_CHECK_HEADER(QtGui/qtgui-config.h,
+	    [lyx_qt5_config=QtGui/qtgui-config.h],
+	    [lyx_qt5_config=qconfig.h],[-])
+	  AC_MSG_CHECKING([whether Qt uses the X Window system])
 	  AC_EGREP_CPP(xcb,
-	    [#include <qconfig.h>
+	    [#include <$lyx_qt5_config>
 	    QT_QPA_DEFAULT_PLATFORM_NAME],
 	    [AC_MSG_RESULT(yes)
 	     AC_DEFINE(QPA_XCB, 1, [Define if Qt uses the X Window System])],
diff --git a/status.22x b/status.22x
index 9f9e1fc742..91125870c6 100644
--- a/status.22x
+++ b/status.22x
@@ -82,6 +82,7 @@ What's new
 
 * BUILD/INSTALLATION
 
+- Correctly determine whether the X11 backend is used by Qt 5.8.
 
 
 ** Bug fixes: