As of May 2015, the owner of copyright in the compiler has relicensed it as well under the zlib license. This means everything is DFSG free.
https://github.com/cc65/cc65/commit/aeb849257277a6b98542de8579697b81c6dd70e6 ** Summary changed: - [needs-packaging] CA65 + [needs-packaging] cc65 and ca65 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/318533 Title: [needs-packaging] cc65 and ca65 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/318533/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs