Hi Brad, thanks for your patience. In the past I misused REQUIRED_VARS several times... Find my most recent attempt: https://github.com/gruenich/CMake/commit/9c0ced4b46599c08e0d3c4c5cb913e52562ea1d2 Bye Christoph -- You have to fall in love with the process of becoming great. [Blake Griffin quoting his collage coach]