diff --git a/include/boost/config.hpp b/include/boost/config.hpp
index f9433181..d27d15fd 100644
--- a/include/boost/config.hpp
+++ b/include/boost/config.hpp
@@ -389,6 +389,17 @@
 #      define BOOST_NO_SLIST
 #      define BOOST_NO_HASH
 #      define BOOST_NO_STD_ITERATOR_TRAITS
+       // although sunpro 5.1 supports the syntax for
+       // inline initialization it often gets the value
+       // wrong, especially where the value is computed
+       // from other constants (J Maddock 6th May 2001)
+#      define BOOST_NO_INCLASS_MEMBER_INITIALIZATION
+       // although sunpro 5.1 supports the syntax for
+       // partial specialization, it often seems to
+       // bind to the wrong specialization.  Better
+       // to disable it until suppport becomes more stable
+       // (J Maddock 6th May 2001).
+#      define BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
 #    endif
 #    if __SUNPRO_CC <= 0x500
 #      define BOOST_NO_MEMBER_TEMPLATES
@@ -579,3 +590,5 @@ namespace std {
 
 
 
+
+