Hi,
You would normally use the 'patch' utility (which comes with recent versions of Strawberry perl - and is otherwise found readily). If you have Strawberry Perl try entering:

patch --help
[download]

Often it's just a matter of running 'patch ScanDeps.pm ScanDeps.patch' - which should suffice in this instance.

For a small patch, you can always do it by hand if you like. The patch on the page you linked to could be applied by hand by replacing (in ScanDeps.pm):

# 5.8.x
push @files, (map "$dir/$_.pl", qw( Exact Canonical ));
[download]

with

# 5.8.x and higher
push @files, (map "$dir/$_.pl", qw( Exact Canonical Heavy ));
[download]

Cheers,
Rob