several ports: clang include errors on 12

[Beeblebrox]

I just got another strange error:
poudriere built emulators/linux_base-c6 when ı have in
poudriere.d/make.conf DEFAULT_VERSIONS+=  linux=c

I cloned ports as:
git clone --depth 1 --branch master https://github.com/freebsd/freebsd-ports
I'd guess that's where the problem is.
Should I have chosen  "--branch svn-head"?

-- 
FreeBSD_amd64_12
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