note Plankton You could build and install the same version of Perl on your system twice. Just when you run <code>Configure</code> to build and install your second version use <code>--prefix=/some/where/else</code>. Then install the module you want to test in both Perl's. Something like <code> $ /where/you/put/bin/perl -MCPAN shell cpan> install NWCLARK/Foo-Bar-0.02.tar.gz ... $ /some/where/else/bin/perl -MCPAN shell cpan> install NWCLARK/Foo-Bar-0.01.tar.gz </code> Then in your test script just change the shebang. 991961 991961