--- firefox-49.0.1.orig/gfx/angle/src/common/angleutils.cpp	2016-07-25 22:22:05.000000000 +0200
+++ firefox-49.0.1/gfx/angle/src/common/angleutils.cpp	2016-10-01 23:24:47.412037504 +0200
@@ -11,6 +11,7 @@
 
 #include <limits>
 #include <vector>
+#include <cstdio>
 
 namespace angle
 {
