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diff --git a/lf_portable_cas.h b/lf_portable_cas.h
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+/*
+ * File     : portable_cas.h
+ * Author   : Jérémy Zurcher  <jeremy@asynk.ch>
+ * Date     : 05/01/10
+ * License  :
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining
+ *  a copy of this software and associated documentation files (the
+ *  "Software"), to deal in the Software without restriction, including
+ *  without limitation the rights to use, copy, modify, merge, publish,
+ *  distribute, sublicense, and/or sell copies of the Software, and to
+ *  permit persons to whom the Software is furnished to do so, subject to
+ *  the following conditions:
+ *  
+ *  The above copyright notice and this permission notice shall be
+ *  included in all copies or substantial portions of the Software.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef LF_PORTABLE_CAS_H_
+#define LF_PORTABLE_CAS_H_
+
+#if __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050
+    #define CompareAndSwapInt(ptr,old_value, new_value) OSAtomicCompareAndSwapInt(old_value, new_value, ptr)
+    #define CompareAndSwapPointer(ptr,new_value,old_value) OSAtomicCompareAndSwapPtr (old_value, new_value, ptr)
+#elif defined(_MSC_VER)
+    #define CompareAndSwapInt(ptr,old_value,new_value) InterlockedCompareExchange(ptr, new_value, old_value)
+    #define CompareAndSwapPointer(ptr,new_value,old_value) InterlockedCompareExchange(ptr, new_value, old_value)
+#elif (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40100
+    #define CompareAndSwapInt(ptr,old_value,new_value) __sync_bool_compare_and_swap(ptr, old_value, new_value)
+    #define CompareAndSwapPointer(ptr,new_value,old_value) __sync_val_compare_and_swap(ptr, old_value, new_value)
+#else
+#  error No implementation
+#endif
+
+# endif /* LF_PORTABLE_CAS_H_ */