Index: crc.hpp
===================================================================
--- crc.hpp	(revision 7623)
+++ crc.hpp	(working copy)
@@ -347,7 +347,7 @@
 #if defined(__EDG_VERSION__) && __EDG_VERSION__ <= 243
         static const least sig_bits = (~( ~( 0ul ) << Bits )) ;
 #else
-        BOOST_STATIC_CONSTANT( least, sig_bits = (~( ~(least( 0u )) << Bits )) );
+        BOOST_STATIC_CONSTANT( least, sig_bits = (~( (unsigned int)(~(least( 0ul ))) << Bits )) );
 #endif
 #if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 0 && __GNUC_PATCHLEVEL__ == 2
         // Work around a weird bug that ICEs the compiler in build_c_cast