When I try the following: $ echo "#include <windows.h>" >foo.cc && c++ -c foo.cc I get tons of redefinition errors on Interlocked functions in winbase.h. -- 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