The current DEPEND-string of flask-migrate reads: DEPEND="${RDEPEND} dev-python/setuptools[${PYTHON_USEDEP}] dev-python/alembic[${PYTHON_USEDEP}] dev-python/flask-sqlalchemy[${PYTHON_USEDEP}] dev-python/flask-script[${PYTHON_USEDEP}] At the least, the latter three must move to RDEPEND -- there is just no way how the script would work without them. Also, in python, in general there is no use for sole DEPEND packages, with the exception of setuptools perhaps. All current versions of the package are affected.
solved in version bump to 2.0