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On some platforms, e.g. arm64, gcc tries to look for non-existent
directories under /usr, and complains when forbidden to do so. To fix this,
we must allow the entirety of /usr.
The only reason we don't allow the entirety of /usr is because on FreeBSD,
home directories are located in /usr/home. However, this is easily fixed
by using the current logic if /usr/home exists, and otherwise allow
everything under /usr.