2006/5/27, Karl Berry <karl at freefriends.org>: > ifdef __USE_GNU: > > Ok, so the question is why and how is __USE_GNU being defined. > It's not explicitly in the TeX sources anywhere. The gnu-cpp docs hint at using __GNUC__ instead. See http://gcc.gnu.org/onlinedocs/cpp/Common-Predefined-Macros.html#Common-Predefined-Macros Best Martin