is heavily influenced by src/distrib/notes/Makefile.inc, from Ross Harvey.
While here, fix a typo and nuke some trailing spaces, to make mdoc more comfortable.
X/Open Commands and Utilities, Issue 5 (XCU5) standard, as well as a
directory structure in which documents detailing NetBSD's compliance
with other standards from X/Open and other bodies can be imported.
The XCU5 documentation presented here is _far_ from finished, but I wanted
to get something in tree for people to review and comment upon.