[Bug 198045] x11-toolkits/pango : Build tools hiding dependency issues

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198045

--- Comment #8 from Melvyn Sopacua <m.r.sopacua at gmail.com> ---
I can agree on a case-by-case base and the discussion about the flaws in
poudriere and similar be moved to ports at .
However, using the .if exists() construct is probably something that is not
understood well by maintainers. The construct can **only** be used when: The
file tested for is guaranteed to be generated before this Makefile is loaded.
When the file is generated by a dependency, this condition fails for rather
obvious reasons.
The only sure fire use for this construct is to test for a **system** file: if
/usr/sbin/mailwrapper exists, we can assume that filling mailer.conf is a
useful exercise.

The interpreter problem is definitely portmgr territory. I doubt that the
WARNING issued by `Mk/Uses/python.mk` about mismatched versions ever triggers
in poudriere builds. Having forgotten about this bugreport, I've even made a
case for this in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212273 .

The third case, I've not encountered anymore and probably has been eliminated
over time.

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