Possible Duplicate:
upgrading and installing packages through the cygwin command line?
Is there an equivalent of apt-get in Cygwin?
Possible Duplicate:
upgrading and installing packages through the cygwin command line?
Is there an equivalent of apt-get in Cygwin?
There is an apt-cyg script.
Check out the issues tab. There are some known issues although they appear to be clearing up. It also requires that you install subversion to maintain the latest copy.