Ask HN: Have licenses ever stopped you from combining two FOSS programs?

Not all FOSS licenses are compatible with each other. The best-known example is that the CDDL and GPL are incompatible, which is why the mainline Linux kernel doesn’t have ZFS. I’m curious how common this actually is, though. Aside from the ZFS-on-Linux case, has anyone else wanted to combine two FOSS programs but been unable to because of a license […]