+ if test x$USE_QT5 = xyes ; then
+ save_CPPFLAGS=$CPPFLAGS
+ AC_MSG_CHECKING([whether Qt uses the X Window system])
+ CPPFLAGS="$save_CPPFLAGS $QT_CORE_INCLUDES"
+ AC_EGREP_CPP(xcb,
+ [#include <qconfig.h>
+ QT_QPA_DEFAULT_PLATFORM_NAME],
+ [AC_MSG_RESULT(yes)
+ AC_DEFINE(QPA_XCB, 1, [Define if Qt uses the X Window System])],
+ [AC_MSG_RESULT(no)])
+ CPPFLAGS=$save_CPPFLAGS
+ fi
+