Subject: | Tests should use $^X instead of perl |
See http://www.cpantesters.org/cpan/report/cb6860f2-de5f-11e3-a074-df2373305bfd for a sample fail report. Here it seems that the system perl is used for some tests (you can recognize it by the presence of "/etc/perl" in @INC, which is unique for Debian's system perl).
Regards,
Slaven