avoiding "install" for dependencies with PORTS_MODULES

From: G. Paul Ziemba <pz-freebsd-ports_at_ziemba.us>
Date: Tue, 03 May 2022 16:23:26 UTC
An unfortunate property of building ports locally (as opposed to
via poudriere) is that dependencies are often installed to the host
file system during the build even when I am not doing "make install"
to the target port.

I normally sidestep this issue by using poudriere. However, I am trying
to use PORTS_MODULES in conjunction with my kernel upgrade process to
generate ports-based kernel modules matching the new kernel, to avoid the
"disable kmods/reboot/build ports/reenable kmods" dance.

It seems "make buildkernel" uses tool binaries from a prior "make buildworld".

Is it possible to, in a like manner, cause the ports built via PORTS_MODULES
to install and use their dependencies in this same "world" staging tree
(or in some alternate place) instead of directly in the host's file system?

G. Paul Ziemba
FreeBSD unix:
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