> Linux and BSD options are not available, whatever the .h #defines. Unsupported options should not be shown as features in the headers.
> Many header and library files are shared with newlib, which is used by Cygwin If you checked before responding with a large digress into unrelated details, you could have seen that the file in question is Cygwin's own, and all the history of mods is right there: https://cygwin.com/git/gitweb.cgi?p=newlib-cygwin.git;a=blame;f=winsup/cygwin/include/netinet/tcp.h;h=becbec54f800722a2efff2ab4676a71752189d74;hb=HEAD -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple