diff -urp boost_1_48_0~/boost/optional/optional.hpp boost_1_48_0/boost/optional/optional.hpp
--- boost_1_48_0~/boost/optional/optional.hpp	2012-01-16 16:15:29.743239804 +0100
+++ boost_1_48_0/boost/optional/optional.hpp	2012-01-16 16:17:47.488242994 +0100
@@ -127,7 +127,7 @@ class aligned_storage
     union
     // This works around GCC warnings about breaking strict aliasing rules when casting storage address to T*
 #if defined(BOOST_OPTIONAL_DETAIL_USE_ATTRIBUTE_MAY_ALIAS)
-    __attribute__((may_alias))
+    __attribute__((__may_alias__))
 #endif
     dummy_u
     {