Building code (on Solaris, OmniOS, and SmartOS, using gcc) which includes boost, produces warnings such as the following: In file included from src/boost/config/platform/solaris.hpp:17:0, from src/boost/config.hpp:57, from src/boost/cstdint.hpp:36, from src/code_that_includes_boost.cpp:43: src/boost/config/posix_features.hpp:27:0: warning: "BOOST_HAS_STDINT_H" redefined [enabled by default] # define BOOST_HAS_STDINT_H ^ Not a big deal, but figured I’d report it in case it hadn’t been reported yet.