dev-python/matplotlib-2.1.0 depends on packages like functools32, which are only useful for its python2 implementation: dev-python/functools32[${PY2_USEDEP}] dev-python/subprocess32[${PY2_USEDEP}] When matplotlib is compiled for python3 only, these packages are still pulled by portage, although obviously not required for matplotlib in this case. I suggest guarding those packages with python_targets_python2_7?, like python_targets_python2_7? ( dev-python/functools32[${PY2_USEDEP}] ) python_targets_python2_7? ( dev-python/subprocess32[${PY2_USEDEP}] )
--- matplotlib-2.1.0-r1.ebuild 2018-01-16 14:44:34.089659300 +0100 +++ matplotlib-2.1.0-r2.ebuild 2018-01-16 14:33:02.688704900 +0100 @@ -34,18 +34,20 @@ # #456704 -- a lot of py2-only deps PY2_USEDEP=$(python_gen_usedep python2_7) +PY2_DEPEND=" + $(python_gen_cond_dep 'dev-python/functools32[${PYTHON_USEDEP}]' python2_7) + $(python_gen_cond_dep 'dev-python/subprocess32[${PYTHON_USEDEP}]' python2_7) + $(python_gen_cond_dep 'dev-python/backports-functools-lru-cache[${PYTHON_USEDEP}]' python2_7)" + COMMON_DEPEND=" dev-python/cycler[${PYTHON_USEDEP}] - dev-python/functools32[${PY2_USEDEP}] >=dev-python/numpy-1.7.1[${PYTHON_USEDEP}] dev-python/python-dateutil:0[${PYTHON_USEDEP}] dev-python/pytz[${PYTHON_USEDEP}] >=dev-python/six-1.10[${PYTHON_USEDEP}] - dev-python/subprocess32[${PY2_USEDEP}] media-fonts/stix-fonts media-libs/freetype:2 media-libs/libpng:0 - python_targets_python2_7? ( dev-python/backports-functools-lru-cache[${PY2_USEDEP}] ) >=media-libs/qhull-2013 cairo? ( dev-python/cairocffi[${PYTHON_USEDEP}] ) gtk2? ( @@ -59,6 +61,7 @@ # dev-python/pycxx DEPEND="${COMMON_DEPEND} + ${PY2_DEPEND} dev-python/versioneer[${PYTHON_USEDEP}] dev-python/setuptools[${PYTHON_USEDEP}] virtual/pkgconfig
commit 908d8e520d6078a592ce8db946e86f9e26a8bbdc (HEAD -> master, origin/master, origin/HEAD) Author: Andrey Grozin <grozin@gentoo.org> Date: Tue Jan 16 21:44:04 2018 +0700 dev-python/matplotlib: in python3-only setup, don't pull python2 packages in Suggested-by: jan vereecke <vereecke.jan@skynet.be> Closws: https://bugs.gentoo.org/642090 Package-Manager: Portage-2.3.19, Repoman-2.3.6
