Packages with the resolvconf use flag

net-misc / networkmanager : A set of co-operative tools that make networking simple and straightforward

  • Use net-dns/openresolv for managing DNS information in /etc/resolv.conf. Generally, a symlink to /run/NetworkManager/resolv.conf is simpler. On systems running systemd-resolved, disable this flag and create a symlink to /run/systemd/resolve/stub-resolv.conf.

net-vpn / vpnc : Free client for Cisco VPN routing software

  • Enable support for DNS managing framework net-dns/openresolv

sys-apps / systemd : System and service manager for Linux

  • Install resolvconf symlink for systemd-resolve