The postinstall note tells the user to add a sysctl variable to /etc/sysctl.conf. This is no longer necessary since 11.0. Please reference: https://svnweb.freebsd.org/base?view=revision&revision=289112 To avoid unnecessary hassle for users, please amend the postinstall message similar like the Gimp one has been amended (see also PR 204919, link: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=204919#c10 ) Here is the Gimp postinstall note amendment, for your convenience: "FreeBSD 11.0-R and newer have this set by default." Thank you.
A commit references this bug: Author: cpm Date: Tue Feb 20 22:53:49 UTC 2018 New revision: 462463 URL: https://svnweb.freebsd.org/changeset/ports/462463 Log: Update comment in pkg-message. Iridium needs kern.ipc.shm_allow_removed=1, which is default for 11.0-R and newer. PR: 225712 Reported by: Stefan B. <sblachmann@gmail.com> Changes: head/www/iridium/pkg-message
It has also been fixed for chromium by ports r462416