--- a/webrtc/rtc_base/system/arch.h.orig
+++ b/webrtc/rtc_base/system/arch.h
@@ -63,6 +63,12 @@
 #elif defined(__powerpc__)
 #define WEBRTC_ARCH_BIG_ENDIAN
 #define WEBRTC_ARCH_32_BITS
+#elif defined(__s390x__)
+#define WEBRTC_ARCH_BIG_ENDIAN
+#define WEBRTC_ARCH_64_BITS
+#elif defined(__s390__)
+#define WEBRTC_ARCH_BIG_ENDIAN
+#define WEBRTC_ARCH_32_BITS
 #else
 #error Please add support for your architecture in rtc_base/system/arch.h
 #endif
# #else
# /* instead of failing, use typical unix defines... */
# #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__