I don't have a login there, so here's the info via mail. Please add it to the thread in the forum.
The linux-dist ports are not designed to be a replacement for the linux_base ports. So if the intend is to use it like this: the user experience will be not as expected (linking from /compat/linux to /usr/local/gentoo-stage3 is not enough, the linux_base ports make some modifications to the linux-bits to have a better "integrated into FreeBSD"-experience).
If the intend is to have some kind of full-linux-system on FreeBSD (chrooting into it and then working in this linux environment), you can link the linsysfs and linprocfs into /usr/local/gentoo-stage3 (create the corresponding directories if they are not there). Again (as it is important): chrooting into this env and working in it is OK, using it as a replacement of the linux_base ports will give unexpected results.
Bye,
Alexander.