File surf-constchar.patch of Package surf

--- surf/surf/image-formats/ByExtension.cc
+++ surf/surf/image-formats/ByExtension.cc
@@ -88,7 +88,7 @@
 		}
 		
 		// just look for "*.extension"
-		char* ext = strrchr(filename, '.');
+		const char* ext = strrchr(filename, '.');
 		if (ext == 0) {
 			return 0;
 		}