These modules define nixosModules.cad (and freecad/openscad) referenced by the t480 host module list but were untracked, so the flake could not resolve them (undefined variable 'cad'). Track them so the build evaluates.
These modules define nixosModules.cad (and freecad/openscad) referenced by the t480 host module list but were untracked, so the flake could not resolve them (undefined variable 'cad'). Track them so the build evaluates.