Comparing the file META.yml between the tarball as produced by Warren and the one made here locally, I see some notable differences. A missing license name may be an issue, and the 'recommends' section seems like a valuable source of information, made visible by a newer version of ExtUtils::MakeMaker :
-license: ~ -generated_by: ExtUtils::MakeMaker version 6.42 +license: apache +generated_by: ExtUtils::MakeMaker version 6.55_02 +resources: + bugtracker: https://issues.apache.org/SpamAssassin/ + homepage: http://spamassassin.apache.com/ + license: http://www.apache.org/licenses/LICENSE-2.0.html + MailingList: http://wiki.apache.org/spamassassin/MailingLists + repository: http://svn.apache.org/repos/asf/spamassassin/ +recommends: + Archive::Tar: 1.23 + Compress::Zlib: 0 + DB_File: 0 + DBI: 0 + Encode::Detect: 0 + Getopt::Long: 2.32 + HTTP::Date: 0 + IO::Socket::INET6: 0 + IO::Socket::SSL: 0 + IO::Zlib: 1.04 + IP::Country::Fast: 0 + LWP::UserAgent: 0 + Mail::DKIM: 0.37 + Mail::SPF: 0 + MIME::Base64: 0 + Net::Ident: 0 + Net::SMTP: 0 + Razor2::Client::Agent: 2.61 Mark
