--- mozilla/netwerk/protocol/http/HttpChannelParent.cpp	2012-03-13 06:33:04.000000000 +0100
+++ mozilla/netwerk/protocol/http/HttpChannelParent.cpp-new	2012-03-27 15:47:38.000000000 +0200
@@ -333,10 +333,17 @@ HttpChannelParent::RecvUpdateAssociatedC
   return true;
 }
 
-// Bug 621446 investigation, we don't want conditional PR_Aborts bellow to be
+// Bug 621446 investigation, we don't want conditional PR_Aborts below to be
 // merged to a single address.
+#ifdef _MSC_VER
 #pragma warning(disable : 4068)
+#endif
+// Compiling with a version of GCC <= 4.4 fails with an internal compiler
+// error.
+#if !defined(__GNUC__) || \
+  (__GNUC__ >= 5) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
 #pragma GCC optimize ("O0")
+#endif
 
 bool
 HttpChannelParent::RecvRedirect2Verify(const nsresult& result,