Why didn't you search first? this is answered more times, lik here:
Creating a windows EXE from Perl script
> Also, is it too hard to port a perl program that uses various downloaded libraries from Windows to UNIX
That depends on the libraries, are they perl specific? yes, just download them via cpan...
"We all agree on the necessity of compromise. We just can't agree on when it's necessary to compromise." - Larry Wall.