--- rxvt-unicode/src/rxvtutil.h	2006/01/30 16:12:58	1.24
+++ rxvt-unicode/src/rxvtutil.h	2007/10/31 09:55:24	1.29
@@ -4,13 +4,14 @@
 #include <cstdlib>
 #include <cstring>
 
+using namespace std;
+
 #define PP_CONCAT_(a, b) a ## b
 #define PP_CONCAT(a, b) PP_CONCAT_(a, b)
 #define PP_STRINGIFY_(a) #a
 #define PP_STRINGIFY(a) PP_STRINGIFY_(a)
 
-// actually, some gcc-3.x versions work, too
-#define HAVE_GCC_BUILTINS (__GNUC__ >= 4)
+#define HAVE_GCC_BUILTINS (__GNUC__ >= 4 || (__GNUC__ == 3 && __GNUC_MINOR__ == 4))
 
 #ifndef __attribute__
 # if __GNUC__
@@ -56,12 +57,14 @@
 
 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
 T lerp (T a, U b, P p)
 {
-  return (int(a) * int(p) + int(b) * int(100 - p)) / 100;
+  return (long(a) * long(100 - p) + long(b) * long(p) + 50) / 100;
 }
 
 // some bit functions, xft fuck me plenty
@@ -89,7 +92,7 @@
 };
 
 /* simplevec taken (and heavily modified), from:
- * 
+ *
  *  MICO --- a free CORBA implementation
  *  Copyright (C) 1997-98 Kay Roemer & Arno Puder
  */