diff -r 000000000000 -r 6474c204b198 build/macosx/universal/mozconfig
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/macosx/universal/mozconfig	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# i386/x86-64 Universal Build mozconfig
+
+# As used here, arguments in $MOZ_BUILD_PROJECTS are suitable as arguments
+# to gcc's -arch parameter.
+mk_add_options MOZ_BUILD_PROJECTS="i386 x86_64"
+
+. $topsrcdir/build/macosx/universal/mozconfig.common