--- mozilla/ipc/chromium/src/build/build_config.h.orig	2011-11-21 12:18:33.736681000 +0100
+++ mozilla/ipc/chromium/src/build/build_config.h	2011-11-21 12:19:47.289191000 +0100
@@ -57,6 +57,9 @@
 #define ARCH_CPU_ARMEL 1
 #define ARCH_CPU_32_BITS 1
 #define WCHAR_T_IS_UNSIGNED 1
+#elif defined(__powerpc64__)
+#define ARCH_CPU_PPC64 1
+#define ARCH_CPU_64_BITS 1
 #elif defined(__ppc__) || defined(__powerpc__)
 #define ARCH_CPU_PPC 1
 #define ARCH_CPU_32_BITS 1