how do I get apache24 to stay installed with mod_mpm_event and mod_python?

[George Michaelson]

I have hand-built apache24 with mod_mpm_event and mod_python. I
selected the 'all modules as shared libs' option in make configure, in
a belief this would externalize the mod_ stuff so I had an otherwise
"normal" apache install. It would seem thats not so.

When I update/upgrade, I get overwritten by pkg apache24 which does
not have this module, nor the mod_python dependency I need. This then
requires me to hand install again from /usr/ports/www/apache24 having
removed work/.install*done

Whats the canonical recipe to tell pkg and port to "play nice" so you
can have non-standard builds of things?

I tried looking, but the question "how do I make pkg and port play
nice" didn't seem to work. Whats the search term I should have used?
Seems to me like a plausible FAQ.