$ perl5.10.0 -e 'use Foo v0.1.1'

$ perl5.8.9 -e 'use Foo v0.1.1'

$ perl5.10.0 -e 'use Foo v0.2.1'
Foo version v0.2.1 required--this is only version v0.1.1 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.

$ perl5.8.9 -e 'use Foo v0.2.1'
Foo version 0.002001 required--this is only version 0.001001 at -e line 1.
BEGIN failed--compilation aborted at -e line 1.