+/* Define this if you have the functions XF86VidModeGetModeLine() and
+ * XF86VidModeGetViewPort(), in support of virtual desktops where the
+ * X server's root window is bigger than the actual screen. This is
+ * an XFree86 thing, and probably doesn't exist elsewhere. (It's
+ * available if the file /usr/include/X11/extensions/xf86vmode.h exists.)
+ */
+#undef HAVE_XF86VMODE
+
+/* Define this if you have the functions XF86VidModeGetGamma() and
+ * XF86VidModeSetGamma(), which allow clients to change the gamma
+ * response of the monitor. This is an XFree86 4.x thing, and probably
+ * doesn't exist elsewhere. (It's available if the file
+ * /usr/include/X11/extensions/xf86vmode.h exists and has stuff about
+ * gamma in it.)
+ */
+#undef HAVE_XF86VMODE_GAMMA
+