Pre-emptive fix for Mac (and possibly some ports) build bustage - if you're going to use a variable to contain a debug output file name it helps if the variable is declared on all platforms the code compiles for.

layout/base/src/nsXIFConverter.cpp

@@ -505,6 +505,9 @@ void nsXIFConverter::WriteDebugFile() {
 
 #elif defined(XP_MAC)
   // XXX Someone please write some Mac debugging code here!
+  const char* filename="xif.xif";
+#else
+  const char* filename="xif.xif";
 
 #endif