Hello! > use -2 version >> https://cygwin.com/ml/cygwin-announce/2015-02/msg00006.html I have just checked, i have it installed. I even tried to reinstall it, but the problem is still there: --- cut --- p.fedin@fedinw7x64 ~ $ gcc -pthread gcc: error: unrecognized command line option '-pthread' gcc: fatal error: no input files compilation terminated. p.fedin@fedinw7x64 ~ $ g++ -pthread g++: error: unrecognized command line option '-pthread' g++: fatal error: no input files compilation terminated. --- cut --- Kind regards, Pavel Fedin Expert Engineer Samsung Electronics Research center Russia -- 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