https://bugzilla.mozilla.org/show_bug.cgi?id=1106323
--- mfbt/double-conversion/utils.h.orig	2013-02-11 23:33:28.000000000 +0100
+++ mfbt/double-conversion/utils.h	2014-11-29 13:32:40.000000000 +0100
@@ -55,7 +55,7 @@
 #if defined(_M_X64) || defined(__x86_64__) || \
     defined(__ARMEL__) || defined(__avr32__) || \
     defined(__hppa__) || defined(__ia64__) || \
-    defined(__mips__) || defined(__powerpc__) || \
+    defined(__mips__) || defined(__powerpc__) || defined(__POWERPC__) || \
     defined(__sparc__) || defined(__sparc) || defined(__s390__) || \
     defined(__SH4__) || defined(__alpha__) || \
     defined(_MIPS_ARCH_MIPS32R2)