Hi desertcrocodile,

Use ExtUtils::Installed module to find the list of modules installed in your system.

 
#!/usr/bin/perl -w
use ExtUtils::Installed;
my $inst    = ExtUtils::Installed->new();
my @modules = $inst->modules();
 foreach $module (@modules){
      print $module . "\n";
}
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Even if this program does not return the module you are looking for, then do direct find command with the module name as find / -iname 'module.pm', it will do a file search.

If you find the path to your perl module add that path into @INC array.