I never see this on my local machine but quite often on some cpantesters results:
v-string in use/require non-portable at /export/home/cpan/pit/bare/conf/perl-5.10.0/.cpanplus/5.10.0/build/DBIx-Connector0.51/blib/lib/DBIx/Connector.pm line 3.
It is only a warning, but it doesn't seem clean somehow. I have no idea about v-strings and their portability and I assume DBIx-Connector tests would be failing if it was a big issue. Something to ignore?
Eliminate v-string warning.