diff -up jack-1.9.5/linux/JackAtomic_os.h.atomic jack-1.9.5/linux/JackAtomic_os.h
--- jack-1.9.5/linux/JackAtomic_os.h.atomic	2010-08-28 15:23:58.000000000 +0200
+++ jack-1.9.5/linux/JackAtomic_os.h	2010-09-01 09:29:03.000000000 +0200
@@ -22,7 +22,7 @@ Foundation, Inc., 59 Temple Place - Suit
 
 #include "JackTypes.h"
 
-#ifdef __PPC__
+#if defined(__PPC__)
 
 static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
 {
@@ -48,9 +48,7 @@ static inline int CAS(register UInt32 va
     return result;
 }
 
-#endif
-
-#if defined(__i386__) || defined(__x86_64__)
+#elif defined(__i386__) || defined(__x86_64__)
 
 #define LOCK "lock ; "
 
@@ -67,6 +65,13 @@ static inline char CAS(volatile UInt32 v
     return ret;
 }
 
+#else
+
+static inline int CAS(register UInt32 value, register UInt32 newvalue, register volatile void* addr)
+{
+    return __sync_val_compare_and_swap((UInt32 *)addr, value, newvalue);
+}
+
 #endif
 
 #endif