Poudriere: Null-mount existing /usr/src folder for "kernel sources"

[Beeblebrox]

Some ports require kernel sources to build.
On a system that has /usr/src already downloaded, how can one null-mount
that folder into poudriere's build environment so that kernel sources are
made available for the poudriere jails?
These probably won't work:
* fstab file and entry in build-jailname/etc/fstab
* /etc/fstab.build-jailname on host
* Adding entry to /usr/local/etc/poudriere.d/jails/build-jailname/fs

I have not found any possible setting in poudriere.conf for this.



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FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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