4 ms·
Most of it is BSD-style licensed, some (less and ssh for example) are dual-licensed, and very few are GPLv2 (the old versions of make, bash, and emacs; but also
by teamhappy 10y ago
Most of it is BSD-style licensed, some (less and ssh for example) are dual-licensed, and very few are GPLv2 (the old versions of make, bash, and emacs; but also current git). vim is licensed under a custom GPLv2-style license.
A lot of GPLv2 code now uses GPLv3 (all the GNU tools obviously) and Apple (and others too) doesn't want to ship GPLv3 code.
Almost all of the userland comes from FreeBSD. Even stuff that Apple could take directly from OpenBSD for example.