-if test "$wxUSE_MOTIF" = 1; then
- dnl use standard macros to check for X headers/libs, this brings support
- dnl for the standard configure options --x-includes and --x-libraries
- AC_PATH_XTRA
+dnl use standard macros to check for X headers/libs, this brings support
+dnl for the standard configure options --x-includes and --x-libraries;
+dnl the path to the X headers/libs is not only needed for motif, but also
+dnl by the OpenGL and XKBlib.h checks further down
+
+AC_PATH_XTRA
+CPPFLAGS="$CPPFLAGS $X_CFLAGS"
+LDFLAGS="$LDFLAGS $X_LIBS"