In OpenBSD-current tools . It is worth noting that, unlike the previously supplied LLVM 8, the tenth version (as well as the ninth) is distributed under the Apache 2.0 license, the use of which is explicitly project license policy.
OpenBSD developers before change of license and assessed this action negatively. However, on with Eurobsdconf it is noted that in the end you will have to compromise and accept code under the Apache 2.0 license into the project. Now it has happened.
Source: opennet.ru