Hello, I am using Spirit with some code that uses the keywords 'and', 'or', etc. MSVC (at least my version, 9.0) does not implement these keywords, but support can be added by including <ciso646>, which just has a bunch of macros, ie. "#define and &&". The problem I am running into is that when I try to compile something that uses Spirit and ciso646, I get this compiler error: boost\mpl\aux_\include_preprocessed.hpp(37) : fatal error C1083: Cannot open include file: 'boost/mpl/aux_/preprocessed/plain/&.hpp': No such file or directory The offending line in include_preprocessed.hpp is: # include BOOST_PP_STRINGIZE(boost/mpl/aux_/preprocessed/AUX778076_PREPROCESSED_HEADER) It looks like the macro 'bitand' is being expanded in here, so it tries to include '&.hpp'. Now, I think this problem has already been solved (mostly). See this archived discussion, where this problem was worked around for 'and' and 'or': http://lists.boost.org/Archives/boost/2004/05/65563.php I have checked the header files in boost/mpl and only see three more conflicts between header names and ciso646 macros: 'bitand', 'bitor', and 'not'. If someone with more expertise than myself could implement a similar workaround for these headers, I would be very grateful. Thanks, Erik -- View this message in context: http://old.nabble.com/Bug-using-mpl-with-%3Cciso646%3E-and-MSVC--tp26851153p... Sent from the Boost - Users mailing list archive at Nabble.com.