Depends on which *BSD you're talking about. On OpenBSD, there are a few GPL programs in core outside of the /usr/src/gnu directory (heimdal, sudo, afs, and bind all have GPL code, from what I can see). In the gnu directory, though:
Code:
$ ls -lh | grep drwx
drwxr-xr-x 2 root wsrc 512B Oct 21 15:19 CVS
drwxr-xr-x 12 root wsrc 1.0K Oct 21 15:19 egcs
drwxr-xr-x 15 root wsrc 512B Oct 21 14:59 gcc
drwxr-xr-x 10 root wsrc 512B Oct 21 15:19 lib
drwxr-xr-x 3 root wsrc 512B Oct 21 15:05 share
drwxr-xr-x 14 root wsrc 1.0K Oct 21 15:19 usr.bin
drwxr-xr-x 5 root wsrc 512B Oct 21 15:18 usr.sbin
$ ls -lh usr.bin/ | grep drwx
drwxr-xr-x 2 root wsrc 512B Oct 21 15:19 CVS
drwxr-xr-x 15 root wsrc 1.5K Oct 21 15:19 binutils
drwxr-xr-x 15 root wsrc 1.0K Oct 21 15:10 binutils-2.17
drwxr-xr-x 20 root wsrc 512B Oct 21 15:15 cc
drwxr-xr-x 15 root wsrc 1.0K Oct 21 15:19 cvs
drwxr-xr-x 3 root wsrc 512B Oct 21 14:39 cxxfilt
drwxr-xr-x 7 root wsrc 1.5K Oct 21 14:39 gas
drwxr-xr-x 6 root wsrc 512B Oct 21 15:19 gcc
drwxr-xr-x 13 root wsrc 512B Oct 21 15:19 ld
drwxr-xr-x 11 root wsrc 1.0K Oct 21 15:19 lynx
drwxr-xr-x 34 root wsrc 5.0K Oct 21 15:19 perl
drwxr-xr-x 12 root wsrc 1.0K Oct 21 15:18 texinfo
$ ls -lh usr.sbin/ | grep drwx
drwxr-xr-x 2 root wsrc 512B Oct 21 15:19 CVS
drwxr-xr-x 5 root wsrc 512B Oct 21 14:44 mkhybrid
drwxr-xr-x 20 root wsrc 512B Oct 21 15:18 sendmail
I would imagine the toolchain bit holds true for most *BSD at the moment since there isn't really a viable mainstream replacement for gcc (yet).
