Anybody ported opendkim to Crux (add-on to postfix)

Hi, DKIM seems desirable these days for self-hosted e-mail MTA for my domains. opendkim seems the way to go as a postfix add-on (more precisely a "milter"). Attempting to ./configure this open source tarball failed from the lack of (BSD lineage) strlcpy and strlcat functions. Also, opendkim configuration has many options. My need is essentially message signature generation (i.e. no current interest in signature validation of incoming messages). Anybody having been there? Anybody having the same feeling about DKIM desirability? Thanks again for Crux distribution! - Thierry Noreau