It's not true that the FSF doesn't approve of any BDS system because of the
other free licenses they uses. They do recommend the latest GNU GPL license
for most software mainly because of it's copy-left function, but this isn't
mandatory for a program to be approved by them.
They don't approve of any BSD system, because they don't know of any such
system which is dedicated to free software, like Trisquel is.
See:
http://www.gnu.org/distros/common-distros.html
http://www.gnu.org/distros/free-system-distribution-guidelines.html
