diff -ru boost_1_34_0/libs/mpl/test/integral_c.cpp boost_1_34_0_ibm/libs/mpl/test/integral_c.cpp
--- boost_1_34_0/libs/mpl/test/integral_c.cpp	2005-05-14 12:00:57.000000000 -0400
+++ boost_1_34_0_ibm/libs/mpl/test/integral_c.cpp	2007-03-21 12:29:00.000000000 -0400
@@ -11,6 +11,10 @@
 // $Date: 2005/05/14 16:00:57 $
 // $Revision: 1.5 $
 
+#if defined(__IBMCPP__)
+#pragma options chars=signed
+#endif
+
 #include <boost/mpl/integral_c.hpp>
 #include <boost/preprocessor/repeat.hpp>