+ save_CPPFLAGS=$CPPFLAGS
+ CPPFLAGS="$save_CPPFLAGS $QT_CORE_INCLUDES"
+ AC_CHECK_HEADER(QtGui/qtgui-config.h,
+ [lyx_qt5_config=QtGui/qtgui-config.h],
+ [lyx_qt5_config=qconfig.h],[-])
+ AC_MSG_CHECKING([whether Qt uses the X Window system])
+ if test x$USE_QT5 = xyes ; then
+ AC_EGREP_CPP(xcb,
+ [#include <$lyx_qt5_config>
+ QT_QPA_DEFAULT_PLATFORM_NAME],
+ [AC_MSG_RESULT(yes)
+ AC_DEFINE(QPA_XCB, 1, [Define if Qt uses the X Window System])],
+ [AC_MSG_RESULT(no)])
+ else
+ AC_PREPROC_IFELSE([AC_LANG_SOURCE([
+ [#include <qglobal.h>],
+ [#ifndef Q_WS_X11],
+ [#error Fail],
+ [#endif]])],
+ qt_use_x11=yes,
+ qt_use_x11=no)
+ AC_MSG_RESULT($qt_use_x11)
+ if test "x$qt_use_x11" = "xyes"; then
+ QT_LIB="$QT_LIB -lX11"
+ fi
+ fi
+ CPPFLAGS=$save_CPPFLAGS
+