The perl -V output might also be handy - though my suspicion is that the issue has little, if anything, to do with perl itself.
I've struck no such problems with my own builds of perl-5.40.0 on Cygwin.

Cheers,
Rob

In reply to Re^2: GPG-Signed modules fail to install using cpanp under CygwinPerl by syphilis
in thread GPG-Signed modules fail to install using cpanp under CygwinPerl by Intrepid

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