Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -811,11 +811,11 @@
 
 	AC_MSG_CHECKING(whether we have an atomic ops assembly implementation)
 	AC_EGREP_CPP(yes, [
 		#if defined(__GNUC__) && (defined(__i386__) || \
 			defined(__x86_64__) || defined(__amd64__)) || \
-			defined(__ppc__)
+			(defined(__ppc__) && !defined(__APPLE_CC__))
 		yes
 		#endif
 	], [
 		AC_MSG_RESULT(yes)
 		atomic_ops="assembly implementation"

Index: src/atomic.h
==================================================================
--- src/atomic.h
+++ src/atomic.h
@@ -24,11 +24,11 @@
 
 #if !defined(OF_HAVE_THREADS)
 # import "atomic_no_threads.h"
 #elif defined(OF_X86_64_ASM) || defined(OF_X86_ASM)
 # import "atomic_x86.h"
-#elif defined(OF_POWERPC_ASM)
+#elif defined(OF_POWERPC_ASM) && !defined(__APPLE_CC__)
 # import "atomic_powerpc.h"
 #elif defined(OF_HAVE_ATOMIC_BUILTINS)
 # import "atomic_builtins.h"
 #elif defined(OF_HAVE_SYNC_BUILTINS)
 # import "atomic_sync_builtins.h"