> I am now trying to revert errata 9 and recompile libcrypto to see if I get > a usable system back. (This is a fun breakage, curl is no longer working > for instance.) If think I will move o to bsd.rd.
You can use ftp(1) instead of curl. > In the hubbub around OpenSSL 1.0.1n I read there was a problem with ABI > breakage, leading to an 1.0.1o release. I wonder if 5.7 errata 9 incurred > the ABI breakage of the snarfed OpenSSL 1.0.1n release. There are no ABI changes in the libcrypto errata in OpenBSD 5.7. Are you sure however, your source tree is really 5.7-STABLE and not a mix of HEAD and 5.7-STABLE?
