Just to get some assumptions out of the way... Have you retrieved the CPAN Storable package, built it and installed it in the local directory? If you're just trying to tweak a .pm and there it has an XS layer then it probably won't work.

An quick alternative to use lib qw{mydir yourdir}; is to use the command line parameter:

If you have installed the package locally you should be able to differentiate between the two versions:

$perl -MStorable -e" print \$Storable::VERSION"
2.13
[download]

and

$perl -I./lib -MStorable -e" print \$Storable::VERSION"
?.??
[download]