If you're using 5.13.5 and get: Can't use string ("Single Author <single-author@exa"...) as an ARRAY ref while "strict refs" in use at /home/avar/g/ExtUtils-MakeMaker/lib/ExtUtils/MM_Unix.pm line 2887. This is the reason: https://rt.cpan.org/Ticket/Display.html?id=61779 Thought I'd note it in case someone else runs into this.