If net-misc/knock supported a 'minimal' USE flag, which would prevent compilation and installation of knockd, I could install the knock(1) binary on non-Linux systems, which do not have iptables. knock(1) also doesn't depend on libpcap. Reproducible: Always
+ 31 Aug 2010; Michael Weber <xmw@gentoo.org> knock-0.5-r1.ebuild, + metadata.xml: + Made knockd daemon optional with IUSE server, fixes bug 311257.