cpan2rpm tries to handle CPAN source files that are .zip rather than .tar.gz, but it fails because it tries to call "tar t" on the zip file. Attached diff fixes this. It's dependent on the diff I submitted in another bug earlier tonight. I ran the diff with whitespace ignored, so you'll probably want to reindent after applying the patch.
Created attachment 114811 [details] patch to fix the problem
This bug hasn't been updated in a long time and targets FE devel. Could you please check that it still occurs with current FE devel and update accordingly ? Thanks.