The current version of pymc3 in portage (3.1) is a bit outdated. Lots of nice fixes and features have been added. Please update the ebuild to a recent version. Currently, the most recent stable versions of dev-python/commonmark and dev-python/recommonmark cannot be installed because of dependency of the outdates pymc3 version. Reproducible: Always
It also requires arviz, which isn't currently packaged (we need also another ebuild). I checked dependencies.
DEPEND=" >=dev-python/arviz-0.4.1[${PYTHON_USEDEP}] >=dev-python/theano-1.0.4[${PYTHON_USEDEP}] >=dev-python/numpy-1.13[${PYTHON_USEDEP}] >=dev-python/scipy-0.18.1[${PYTHON_USEDEP}] >=dev-python/pandas-0.18[${PYTHON_USEDEP}] >=dev-python/patsy-0.4[${PYTHON_USEDEP}] >=dev-python/tqdm-4.8.4[${PYTHON_USEDEP}] >=dev-python/h5py-2.7[${PYTHON_USEDEP}] " RDEPEND="${DEPEND} test? ( >=dev-python/bokeh-0.12.13[${PYTHON_USEDEP}] >=media-gfx/graphviz-0.8.3[${PYTHON_USEDEP}] dev-python/ipython[${PYTHON_USEDEP}] >=dev-python/Keras-2.0.8[${PYTHON_USEDEP}] >=dev-python/numpydoc-0.9.1[${PYTHON_USEDEP}] >=dev-python/pycodestyle-2.3.1[${PYTHON_USEDEP}] >=dev-python/pyflakes-1.5.0[${PYTHON_USEDEP}] >=dev-python/pylint-1.7.4[${PYTHON_USEDEP}] >=dev-python/pytest-cov-2.5.1[${PYTHON_USEDEP}] >=dev-python/pytest-3.0.7[${PYTHON_USEDEP}] >=dev-python/recommonmark-0.4.0[${PYTHON_USEDEP}] >=dev-python/seaborn-0.8.1[${PYTHON_USEDEP}] =dev-python/sphinx-autobuild-0.7.1[${PYTHON_USEDEP}] >=dev-python/sphinx-1.5.5[${PYTHON_USEDEP}] ) " Missing deps in Portage tree: dev-python/arviz For test IUSE: >=dev-python/bokeh-0.12.13 dev-python/Keras dev-python/sphinx-autobuild
Also these are missing from RDEPEND: test? ( >=dev-python/nbsphinx-0.4.2[${PYTHON_USEDEP}] >=dev-python/nose-1.3.7[${PYTHON_USEDEP}] =dev-python/nose-parameterized-0.6.0[${PYTHON_USEDEP}] ) nbsphinx-0.4.2 and nose-parameterized-0.6.0 are also missing from Portage.
As a workaround, I've created an ebuild for 3.1 that excludes the (re)commonmark deps. It's available in my overlay (equaeghe): https://github.com/equaeghe/gentoo-overlay/tree/master/sci-mathematics/pymc3
package(s) removed.