Dario Niedermann <dario(a)darioniedermann.it> wrote on Sat, 23 Sep 2017 11:17:04 +0200: It can be there, if you wish. Here are two snippets from a recent log of a recent "pkg update -f ; pkg upgrade" run on a one of my many *BSD family systems, this one running FreeBSD 11.1-RELEASE-p1: Message from openjdk8-8.131.11: ====================================================================== This OpenJDK implementation requires fdescfs(5) mounted on /dev/fd and procfs(5) mounted on /proc. If you have not done it yet, please do the following: mount -t fdescfs fdesc /dev/fd mount -t procfs proc /proc To make it permanent, you need the following lines in /etc/fstab: fdesc /dev/fd fdescfs rw 0 0 proc /proc procfs rw 0 0 ====================================================================== Message from rust-1.18.0: ====================================================================== Printing Rust backtraces requires procfs(5) mounted on /proc . If you have not already done so, please do the following: mount -t procfs proc /proc To make it permanent, you need the following lines in /etc/fstab: proc /proc procfs rw 0 0 ====================================================================== I've seen such messages in many package installations in the *BSD family, and I generally add the suggested lines to /etc/fstab. Perhaps others more familiar with BSD internals might comment on whether it is many non-BSD software, like the Java Developer's Kit, and Mozilla's rust language, that mostly would like /proc support, or whether there are plenty of native-BSD packages that expect it too. The second edition of Marshall Kirk McKusick, George V. Neville-Neil, and Robert N. M. Watson The Design and Implementation of the FreeBSD Operating System ISBN 0-201-70245-2 (hardcover), 0-321-96897-2 (hardcover) has 5 pages with mention of the /proc filesystem, and nothing that suggests that it is in any way deprecated. ------------------------------------------------------------------------------- - Nelson H. F. Beebe Tel: +1 801 581 5254 - - University of Utah FAX: +1 801 581 4148 - - Department of Mathematics, 110 LCB Internet e-mail: beebe(a)math.utah.edu - - 155 S 1400 E RM 233 beebe(a)acm.org beebe(a)computer.org - - Salt Lake City, UT 84112-0090, USA URL: http://www.math.utah.edu/~beebe/ - -------------------------------------------------------------------------------