diff -r 000000000000 -r 6474c204b198 build/mozconfig.vs2010-common
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/build/mozconfig.vs2010-common	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+# Pymake needs Windows-style paths. Use cmd.exe to hack around this.
+mk_export_correct_style() {
+  mk_add_options "export $1=$(cmd.exe //c echo %$1%)"
+}