diff -Naur avifile-0.7-0.7.38.orig/plugins/libmad/libmad/madconfig.h avifile-0.7-0.7.38/plugins/libmad/libmad/madconfig.h
--- avifile-0.7-0.7.38.orig/plugins/libmad/libmad/madconfig.h	2003-05-21 03:53:26.000000000 +0900
+++ avifile-0.7-0.7.38/plugins/libmad/libmad/madconfig.h	2003-11-17 15:09:58.072518680 +0900
@@ -13,6 +13,8 @@
 #define FPM_SPARC
 #elif ARCH_MIPS
 #define FPM_MIPS
+#elif ARCH_X86_64
+#define FPM_64BIT
 #endif
 
 #endif /* LIBMAD_MADCONFIG_H */