Log Message:
x11/xmem: initial import.

XMem is an X11 utility to display memory and swap usage.  It was
initially created by the K. Shane Hartman (MIT-LCS) and Stuart A. Malone
(MIT-LCS); with features added by Jim Gettys (MIT-Athena), Bob Scheifler
(MIT-LCS), Tony Della Fera (MIT-Athena), and Chris Peterson (MIT-LCS).

Updated 2007/04 by Michelle Konzack, and then by Christian Barthel
(2017/01), who introduced OpenBSD support.