--- Libc/Libc-320.1.3/pthreads/lock.s
+++ Libc/Libc-391/pthreads/lock.s
@@ -46,7 +46,7 @@
 #include <machine/cpu_capabilities.h>
 #undef	__APPLE_API_PRIVATE
 
-#if defined(__ppc__)
+#if defined(__ppc__) || defined(__ppc64__)
 
 #import	<architecture/ppc/asm_help.h>
 #import	<architecture/ppc/pseudo_inst.h>