It looks like on postfix ebuild both smtp-source and smtp-sink are compiled, but not installed. Maybe something like: # Install smtp-source and smtp-sink tool. dobin bin/smtp-sink dobin bin/smtp-source doman man/man1/smtp-sink.1 doman man/man1/smtp-source.1 would be enough. Reproducible: Always Steps to Reproduce: 1. emerge postfix 2. 3. Actual Results: smtp-sink is not in path nor in epm -ql postfix
in postfix-2.2.7. Thanks for the bug report.