--- a/src/direction.h	Thu Sep 06 19:42:48 2007 +0000
+++ b/src/direction.h	Sat Oct 06 21:16:00 2007 +0000
@@ -165,6 +165,9 @@
 	DIAGDIRDIFF_90LEFT  = 3         ///< 90 degrees left
 };
 
+/** Allow incrementing of DiagDirDiff variables */
+DECLARE_POSTFIX_INCREMENT(DiagDirDiff);
+
 /**
  * Applies a difference on a DiagDirection
  *