build custom kernel under FreeBSD 12

[Norbert Koch]

Hello.

I am obviously too stupid to figure out how to build a custom kernel
as non-root user in a non-standard directory.
Under FreeBSD9/10/11 I could put src/ under my own directory
and start a kernel-compilation by just setting $MAKEOBJDIRPREFIX
accordingly. Doing this under FreeBSD12 gives me 'permission denied'
with 'config -d /usr/src/sys/GENERIC ...'. Seems like ${KRNLOBJDIR} is
not set correctly while the other parameters to config are.
I see that Makefiles differ between 12 and older releases.
${OBJTOP} vs. ${OBJTREE}?

So, what am I doing wrong?

Thank you for any help.


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