Homepage link "http://sid.rstack.org/arp-sk/" is dead (HTTP error 404) for more than a month. found with https://repology.org/repository/gentoo/problems and verified. /usr/portage/net-analyzer/arp-sk # GENTOO_MIRRORS="" ebuild arp-sk-0.0.16-r2.ebuild fetch >>> Downloading 'http://sid.rstack.org/arp-sk/files/arp-sk-0.0.16.tgz' --2019-03-17 11:54:12-- http://sid.rstack.org/arp-sk/files/arp-sk-0.0.16.tgz Resolving sid.rstack.org... 217.25.178.74 Connecting to sid.rstack.org|217.25.178.74|:80... connected. HTTP request sent, awaiting response... 404 Not Found 2019-03-17 11:54:12 ERROR 404: Not Found. !!! Couldn't download 'arp-sk-0.0.16.tgz'. Aborting.