Commit 784d6e91 changed OpenSSL such that it does not depend on Perl, but one of the subsequent upgrades broke it:
--8<---------------cut here---------------start------------->8--- $ guix build perl /gnu/store/x2p2biyybcb2wac77qz9468asc5fm48i-perl-5.22.1 $ grep -r x2p2biyybcb2wac77qz9468asc5fm48i $(guix build openssl) /gnu/store/qvx4q6lbwi4s3cwr8wqaa7kcva0a5c4b-openssl-1.0.2f/bin/c_rehash:#!/gnu/store/x2p2biyybcb2wac77qz9468asc5fm48i-perl-5.22.1/bin/perl --8<---------------cut here---------------end--------------->8--- Somehow ‘openssl-c-rehash.patch’ seems to no longer have the desired effect. Ludo’.