Since 1.9, it has auto-detected the libutempter/libulog libraries we provide. Since 2.4 you have to enable detection of the library. Quick and dirty workaround: -CONFIGURE_ARGS+=--sysconfdir=${PREFIX}/etc +CONFIGURE_ARGS+=--sysconfdir=${PREFIX}/etc --enable-utempter We rely on this in the freebsd.org cluster.
A commit references this bug: Author: mat Date: Fri Jul 14 07:58:08 UTC 2017 New revision: 445733 URL: https://svnweb.freebsd.org/changeset/ports/445733 Log: Add utmp support back. UTMP support is no longer auto-detected, it needs to be enabled manually. PR: 220722 Reported by: peter Sponsored by: Absolight Changes: head/sysutils/tmux/Makefile