+/* Define this if you have the SGI-VIDEO-CONTROL extension. This is standard
+ * on Irix systems, and not available elsewhere.
+ */
+#undef HAVE_SGI_VC_EXTENSION
+
+/* Define this if you have the XDPMS extension. This is standard on
+ * sufficiently-recent XFree86 systems, and possibly elsewhere. (It's
+ * available if the file /usr/include/X11/extensions/dpms.h exists.)
+ */
+#undef HAVE_DPMS_EXTENSION
+
+/* 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 a Linux-like /proc/interrupts file which can be
+ * examined to determine when keyboard activity has occurred.
+ */
+#undef HAVE_PROC_INTERRUPTS
+