Also, see this page: http://www.opengroup.org/onlinepubs/000095399/help/codes.html They define subsets of Posix that affect library content, but I could not find macros I could check to see if one of such subsets is available or not.
Just copying Patrick's answer to the list: %%% I think you're looking for this: http://www.opengroup.org/onlinepubs/000095399/basedefs/xbd_chap02.html Out of the dozens upon dozens of macros described there, I would suggest first learning about exactly what _XOPEN_SOURCE and _POSIX_C_SOURCE do; they're very important. Always here for more questions, -Patrick %%%
