The x68k port poffd(8) source lives in sys/arch/x68k/usr.sbin/..., so

ports like the hp300 (or i386, or ...) will never get a chance to
build or install the manual page.  For this reason, the page belongs in
the x68k machine-dependent list, not the "shared machine-dependent" pages.

distrib/sets/lists/man/md.x68k

@@ -12,3 +12,4 @@
 ./usr/share/man/cat1/palette.0
 ./usr/share/man/cat1/tvctrl.0
 ./usr/share/man/cat8/rtcalarm.0
+./usr/share/man/cat8/x68k/poffd.0

distrib/sets/lists/man/md_share

@@ -210,4 +210,3 @@
 ./usr/share/man/cat8/vax/format.0
 ./usr/share/man/cat8/vax/installboot.0
 ./usr/share/man/cat8/vax/makedev.0
-./usr/share/man/cat8/x68k/poffd.0