http://www.openbsd.org/policy.html

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Copyright law admits to three general categories of works:

Original Work
A new work that is not derived from an existing work.
Derivative Work
Work that is derived from, includes or amends existing works.
Compilations
A work that is a compilation of existing new and derivative works.

The fundamental concept is that there is primacy of the copyright, that is a copyright of a derivative work does not affect the rights held by the owner of the copyright of the original work, rather only the part added. Likewise the copyright of a compilation does not affect the rights of the owner of the included works, only the compilation as an entity.
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Всё-таки Google -- великая вещь! :) Как видим, "the compilation as an entity" -- тоже объект авторского права, защищается так же, как и всё остальное.

Безусловно, не нарушая права авторов частей, составляющих компиляцию. То есть, {Free,Net,Open}BSD не может запретить распространять gcc. :)))