diff -r 21cae7efdcc6 src/cmd/cgo/main.go
--- a/src/cmd/cgo/main.go	Sat Nov 14 12:23:24 2009 -0800
+++ b/src/cmd/cgo/main.go	Sun Nov 15 00:00:09 2009 +0100
@@ -52,6 +52,9 @@
 		fatal("unknown architecture %s", arch)
 	}
 
+	// Define the language of gcc error messages.
+	os.Setenv("LC_ALL", "C");
+
 	p := openProg(input);
 	for _, cref := range p.Crefs {
 		// Convert C.ulong to C.unsigned long, etc.