if problem still actual i'll answer:
to share /proc you need install linux_base port on your freebsd box using ports or something like packages
for example on my box:
#cd /usr/ports/emulators/linux_base
#make install clean
if something goes wrong try to install it with package
(ftp://ftp.freebsd.org/pub/FreeBSD/releases/YOUR_PLATFORM/YOUR_RELEASE/packages/All.... )
then edit /etc/fstab and add string like:
linproc /proc linprocfs rw 0 0
and add autoload kernel module linux.ko
in any case you may search at www.google.com
!!
there are a lot of information and howtos!