poudriere: make: don't know how to make check-sanity. Stop

[Ultima]

Hello FreeBSD porters,

Keep running into an issue where poudriere will return "make: don't know
how to make check-sanity. Stop" when modifying a Makefile. This is very
troublesome when attempting to test patches. Does anyone have an idea why
this would occur?

[1] is an example of testing a patch for bug #231397 and [2] is without the
patch, working as expected.

[1]
https://poudriere.ultimasbox.com/data/104i386-test/2018-09-17_13h00m20s/logs/errors/gpxsee-5.18.log
[2]
https://poudriere.ultimasbox.com/data/104i386-test/2018-09-17_13h02m29s/logs/gpxsee-5.16_2.log

Thanks and best regards,
Richard Gallamore