diff -rupN mozilla-release.orig/config/system-headers mozilla-release/config/system-headers
--- mozilla-release.orig/config/system-headers	2015-10-18 17:35:49.589375378 +0200
+++ mozilla-release/config/system-headers	2015-10-18 17:36:45.288324530 +0200
@@ -466,6 +466,7 @@ freetype/ftsizes.h
 freetype/ftadvanc.h
 freetype/ftbitmap.h
 freetype/ftxf86.h
+freetype/ftfntfmt.h
 freetype.h
 ftcache.h
 ftfntfmt.h