The ebuild lists http://jaakko.home.cern.ch/jaakko/Soft/ as the homepage for this program, but it appears Jakko is no longer employed at CERN. The author has a personal site at http://www.saunalahti.fi/~jaakoive/ and Github https://github.com/oh7bf His Github for this package is https://github.com/oh7bf/adifmerg I'm pretty sure this is the same guy,
Fixed. Thanks for reporting Joe.