>> +         (add-after 'install 'wrap-program
>> +                    (lambda _
>> +                      (wrap-program (string-append (assoc-ref %outputs "out")
>> +                                                   "/bin/swaks")

It would be nice if the perl-build-system did this wrapping
automatically just like the python-build-system does. Is there some
reason the perl-build-system doesn't do wrapping automatically?

> Otherwise this LGTM, sorry for the nit-picks! Can you send an updated
> patch? :)

No problem. :-) "Nitpicking" and critical feedback is part of the patch
review process.

I'll send a new patch soon.