Note it's licensed under the Apache 2.0 license as of the still unreleased version 3.0. Older versions still use the old license, which is the problematic one.

Note it's licensed under the Apache 2.0 license as of the still unreleased version 3.0. Older versions still use the old license, which is the problematic one. Some Linux distros have tried to use the "system library" exception in GPL to argue that it's fine.