Cygwin support has been troublesome for the Rosetta community. Nobody in the community uses Windows or cygwin for development work, and generally we don't even have a cygwin build available for testing. We have de facto not supported cygwin for a while, in the sense that most cygwin problems stumped us. Until this situation changes we are no longer supporting cygwin. Feel free to post your questions on this board anyway; perhaps other cygwin users will be able to help.