Add note to xcbxlib.h that nothing except Xlib/XCB should use it.

diff --git a/src/xcbxlib.h b/src/xcbxlib.h
index 00c76fc..4cb5cd4 100644 (file)
--- a/src/xcbxlib.h
+++ b/src/xcbxlib.h
@@ -25,6 +25,9 @@
  * authorization from the authors.
  */
 
+/* This include file declares functions used by Xlib/XCB, but nothing else
+ * should ever use these functions or link to libxcb-xlib. */
+
 #ifndef __XCBXLIB_H
 #define __XCBXLIB_H