my_mod.pm:

package my_mod;

sub cat{
  print "meeow.\n";
}

sub daddy{ print "Hi, Dad!!!\n";}

1;
[download]

Here is dog:

 
#!/usr/bin/env perl

use my_mod;

my_mod::cat();
my_mod::daddy();
[download]

I tried this exact same on a separate box with a (presumably) different Perl interpreter, and it seemed to work just fine. Could it be something weird going on with the cygwin perl interpreter? And speaking of which, is there any way I could obtain Perl (at least an interpeter, compiler) for Windows (without having to use ActiveState Perl, for which I must eventually pay money)? The Perl interpreter that comes with cygwin is, to say the least, a little squirrelly (okay, maybe my code is too, but still...).