Dear James ,
I dont know why you want to stick to cygwin when a windows port for
PostgreSQL is available just download it at
ftp://ftp22.us.postgresql.org/mirrors/ftp.postgresql.org/win32/postgresql-8.0.0-beta5-en.zip
Kindly note its in beta state thus requesting you to use at maximum
and report errors / bugs here.
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With Best Regards,
Vishal Kashyap.
Lead Software Developer,
http://saihertz.com,
http://vishalkashyap.tk