--- rxvt-unicode/src/rxvtutil.h	2006/01/30 16:12:58	1.24
+++ rxvt-unicode/src/rxvtutil.h	2006/01/30 19:46:13	1.25
@@ -56,6 +56,8 @@
 
 template<typename T, typename U> static inline void swap (T& a, U& b) { T t=a; a=(T)b; b=(U)t; }
 
+template<typename T> static inline T squared_diff (T a, T b) { return (a-b)*(a-b); }
+
 // linear interpolation
 template<typename T, typename U, typename P>
 static inline