--- a/media/webrtc/trunk/build/build_config.h
+++ b/media/webrtc/trunk/build/build_config.h
@@ -123,7 +123,9 @@
 #define ARCH_CPU_PPC_FAMILY 1
 #define ARCH_CPU_PPC64 1
 #define ARCH_CPU_64_BITS 1
+#ifndef _LITTLE_ENDIAN
 #define ARCH_CPU_BIG_ENDIAN 1
+#endif
 #elif defined(__ppc__) || defined(__powerpc__)
 #define ARCH_CPU_PPC_FAMILY 1
 #define ARCH_CPU_PPC 1
@@ -156,6 +158,9 @@
 #elif defined(__alpha__)
 #define ARCH_CPU_ALPHA 1
 #define ARCH_CPU_64_BITS 1
+#elif defined(__aarch64__)
+#define ARCH_CPU_AARCH64 1
+#define ARCH_CPU_64_BITS 1
 #else
 #error Please add support for your architecture in build/build_config.h
 #endif