Ser2Sock and El Capitan

I upgraded my server to El Capitan, and Ser2Sock broke - hard. Tried to do a reinstall of Ser2Sock but the instructions do not work on El Capitan. Specifically, the "make" command fails because
Any ideas? Is this gone for good?
fatal error: 'openssl/bio.h' file not found
Any ideas? Is this gone for good?