$(python_gen_any_dep 'dev-python/pygobject:3[${PYTHON_USEDEP}]') $(python_gen_any_dep 'dev-python/dbusmock[${PYTHON_USEDEP}]') This resolves to || ( pygobject... ) || ( dbusmock... ) which means it can be satisfied by incompatible impls on pygobject and dbusmock, which means it will fail in pkg_setup(). python_gen_any_dep must be used exactly once in every possible combination of USE flags.
Fixed in v40.0.