--- libavcodec/amr/typedefs.h.orig	2006-01-11 09:15:35.250305479 +0000
+++ libavcodec/amr/typedefs.h	2006-01-11 09:17:49.526553739 +0000
@@ -175,6 +175,10 @@
 #define PC
 #define PLATFORM "PC"
 #define LSBFIRST
+#elif defined(linux) && defined(__x86_64__)
+#define PC
+#define PLATFORM "PC"
+#define LSBFIRST
 #else
 #error "can't determine architecture; adapt typedefs.h to your platform"
 #endif