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