on /usr/include/cygwin/in6.h extern const struct in6_addr in6addr_any; extern const struct in6_addr in6addr_loopback; should not a __declspec(dllimport) be added ? Marco -- 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