Index: boost/numeric/interval/hw_rounding.hpp
===================================================================
--- boost/numeric/interval/hw_rounding.hpp	(revision 63328)
+++ boost/numeric/interval/hw_rounding.hpp	(working copy)
@@ -29,6 +29,8 @@
 #  include <boost/numeric/interval/detail/alpha_rounding_control.hpp>
 #elif defined(ia64) || defined(__ia64) || defined(__ia64__)
 #  include <boost/numeric/interval/detail/ia64_rounding_control.hpp>
+#elif defined(i386) && defined(__SUNPRO_CC)
+#  include <boost/numeric/interval/detail/c99_rounding_control.hpp>  
 #endif
 
 #if defined(BOOST_NUMERIC_INTERVAL_NO_HARDWARE) && (defined(__USE_ISOC99) || defined(__MSL__))