All those dests need to be prefaced with $INSTALL_ROOT eg
$INSTALL_ROOT/usr/sbin. Also /usr/libexec isn't provided by smgl-fhs so
you may want to check it's there before using it.
On the .example file, if nrpe will run without that file it should just get
added to the doc dir for this spell, if nrpe needs a file to run (and the
init script at least probably needs it there) that should get installed as
the real name.