Gentoo安装pylint时遇到一个slot conflict:
tankywoo@gentoo-local::~/ » sudo emerge -av pylint
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild U ] dev-python/setuptools-2.2 [0.6.30-r1] PYTHON_TARGETS="python2_7 python3_3%* (-pypy) -python3_2* (-python3_4)
(-python2_5%) (-python2_6%) (-python3_1%)" 769 kB
[ebuild N ] dev-python/logilab-common-0.61.0 USE="-doc {-test}" PYTHON_TARGETS="python2_7 python3_3 (-pypy) -python3_2 (-python3_4)" 195 kB
[ebuild N ] dev-python/astng-0.21.1 USE="{-test}" 98 kB
[ebuild N ] dev-python/pylint-0.23.0 USE="-examples" 196 kB
Total: 4 packages (1 upgrade, 3 new), Size of downloads: 1,256 kB
!!! Multiple package instances within a single package slot have been pulled
!!! into the dependency graph, resulting in a slot conflict:
dev-python/setuptools:0
(**dev-python/setuptools-2.2::gentoo**, ebuild scheduled for merge) pulled in by
dev-python/setuptools[python_targets_python2_7(-)?,python_targets_python3_2(-)?,python_targets_python3_3(-)?,python_targets_python3_4(-)?,
python_targets_pypy(-)?,-python_single_target_python2_7(-),python_single_target_python3_2(-),
-python_single_target_python3_3(-),-python_single_target_python3_4(-),python_single_target_pypy(-)]
required by (**dev-python/logilab-common-0.61.0::gentoo**, ebuild scheduled for merge)
(**dev-python/setuptools-0.6.30-r1::gentoo**, installed) pulled in by
dev-python/setuptools[python_targets_python2_7(-)?,python_targets_python3_2(-)?,python_targets_python3_3(-)?,
-python_single_target_python2_7(-),-python_single_target_python3_2(-),-python_single_target_python3_3(-)]
required by (**dev-python/pip-1.3.1::gentoo**, installed)
dev-python/setuptools[python_targets_python2_7(-)?,python_targets_python3_2(-)?,python_targets_python3_3(-)?,python_targets_pypy(-)?,
-python_single_target_python2_7(-),-python_single_target_python3_2(-),-python_single_target_python3_3(-),-python_single_target_pypy(-)]
required by (**dev-python/pygments-1.5-r1::gentoo**, installed)
It may be possible to solve this problem by using package.mask to
prevent one of those packages from being selected. However, it is also
possible that conflicting dependencies exist such that they are
impossible to satisfy simultaneously. If such a conflict exists in
the dependencies of two different packages, then those packages can
not be installed simultaneously. You may want to try a larger value of
the --backtrack option, such as --backtrack=30, in order to see if
that will solve this conflict automatically.
根据提示，本地的pip-1.3.1和pygments-1.5-r1依赖老版本的setuptools-0.6.30-r1，而pylint依赖新版本的setuptools-2.2，所以就造成了slot conflict。
参考Gentoo Wiki 对这里的说明，其实只需要手动指定新版本setuptools-2.2升级时，同时执行依赖老版本的pip和pygments(不用指定版本号)，这样就会将pip和pygments也升级到合适的高版本中.
tankywoo@gentoo-local::~/ » sudo emerge -avu '=dev-python/setuptools-2.2' dev-python/pip dev-python/pygments
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild U ] dev-python/setuptools-2.2 [0.6.30-r1] PYTHON_TARGETS="python2_7 python3_3%* (-pypy) -python3_2* (-python3_4) (-python2_5%) (-python2_6%) (-python3_1%)" 769 kB
[ebuild U ] dev-python/pip-1.4.1 [1.3.1] USE="zsh-completion" PYTHON_TARGETS="python2_7 python3_3* (-pypy) -python3_2* (-python2_6%)" 435 kB
[ebuild U ] dev-python/pygments-1.6 [1.5-r1] USE="-doc {-test}" PYTHON_TARGETS="python2_7 python3_3* (-pypy) -python3_2* (-pypy1_9%) (-pypy2_0%) (-python2_5%) (-python2_6%) (-python3_1%)" 1,390 kB
Total: 3 packages (3 upgrades), Size of downloads: 2,593 kB
Would you like to merge these packages? [Yes/No]
升级好setuptools后再安装pylint就可以了.