From: Íñigo Huguet on
gitlab.com
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2339#note_1297...
That won't work, either. In the second level sub-make, BUILD_TARGET won't be
empty, but might have a wrong value, inherited from the first level make...
Also, thanks to your comment, I've seen that dist-brew won't respect the
values of DISTRO and DIST set in Makefile.variables, but neither before these
changes. Is that a problem? I guess that it doesn't make sense to set them to
Fedora values, but maybe yes to Centos values?