--- boost/smart_ptr/detail/sp_counted_base.hpp.bak      2012-09-14 19:21:44.000000000 +0100
+++ boost/smart_ptr/detail/sp_counted_base.hpp  2012-09-14 19:22:08.000000000 +0100
@@ -47,7 +47,7 @@
 #elif defined( __MWERKS__ ) && defined( __POWERPC__ )
 # include <boost/smart_ptr/detail/sp_counted_base_cw_ppc.hpp>

-#elif defined( __GNUC__ ) && ( defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc ) )
+#elif !defined( _AIX ) && defined( __GNUC__ ) && ( defined( __powerpc__ ) || defined( __ppc__ ) || defined( __ppc ) )
 # include <boost/smart_ptr/detail/sp_counted_base_gcc_ppc.hpp>

 #elif defined( __GNUC__ ) && ( defined( __mips__ ) || defined( _mips ) )