libversion-requirements-perl 0.101020-1 (i386 binary) in ubuntu precise

 A Version::Requirements object models a set of version constraints like those
 specified in the META.yml or META.json files in CPAN distributions. It can be
 built up by adding more and more constraints, and it will reduce them to the
 simplest representation.
 .
 Logically impossible constraints will be identified immediately by thrown
 exceptions.