For a long time, several pkgs have been refusing to install,
apparently due to a conflict re python targets :

root:595 ~> emerge -pv certifi file pyblake2 meson setuptools   
Calculating dependencies... done!
[ebuild   R    ] dev-python/setuptools-36.7.2  PYTHON_TARGETS="-python3_4* 
-python3_5* python3_6*" 
[ebuild     U  ] dev-python/certifi-2018.4.16 [2017.4.17] 
PYTHON_TARGETS="-python3_4* -python3_5* python3_6* (-python3_7)" 
[ebuild     U  ] sys-apps/file-5.33-r4 [5.32] PYTHON_TARGETS="-python3_4* 
python3_6* (-python3_7)" 
[ebuild     U  ] dev-python/pyblake2-1.1.2 [1.1.0] PYTHON_TARGETS="(-pypy3) 
-python3_4* -python3_5* python3_6* (-python3_7)" 
[ebuild     U  ] dev-util/meson-0.46.1 [0.45.1] PYTHON_TARGETS="-python3_5* 
python3_6*" 

!!! 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-36.7.2:0/0::gentoo, ebuild scheduled for merge) pulled 
in by
    
dev-python/setuptools[python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_python3_5(-),-python_single_target_python3_6(-)]
 required by (dev-util/meson-0.46.1:0/0::gentoo, ebuild scheduled for merge)

    
dev-python/setuptools[python_targets_pypy(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,python_targets_python3_7(-)?,-python_single_target_pypy(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-),-python_single_target_python3_7(-)]
 required by (sys-apps/file-5.33-r4:0/0::gentoo, ebuild scheduled for merge)

    dev-python/setuptools (Argument)
    
dev-python/setuptools[python_targets_pypy(-)?,python_targets_pypy3(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,python_targets_python3_7(-)?,-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-),-python_single_target_python3_7(-)]
 required by (dev-python/pyblake2-1.1.2:0/0::gentoo, ebuild scheduled for merge)

    
dev-python/setuptools[python_targets_pypy(-)?,python_targets_pypy3(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,python_targets_python3_7(-)?,-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-),-python_single_target_python3_7(-)]
 required by (dev-python/certifi-2018.4.16:0/0::gentoo, ebuild scheduled for 
merge)

  (dev-python/setuptools-36.7.2:0/0::gentoo, installed) pulled in by
    
dev-python/setuptools[python_targets_python2_7(-),python_targets_python3_4(-),python_targets_python3_5(-),-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]
 required by (dev-python/certifi-2017.4.17:0/0::gentoo, installed)

    
dev-python/setuptools[python_targets_pypy(-)?,python_targets_pypy3(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,python_targets_python3_7(-)?,-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-),-python_single_target_python3_7(-)]
 required by (dev-python/pygments-2.2.0:0/0::gentoo, installed)

dev-python/certifi:0

  (dev-python/certifi-2018.4.16:0/0::gentoo, ebuild scheduled for merge) pulled 
in by
    dev-python/certifi (Argument)
    
>=dev-python/certifi-2016.9.26[python_targets_pypy(-)?,python_targets_pypy3(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]
 required by (dev-python/setuptools-36.7.2:0/0::gentoo, ebuild scheduled for 
merge)

  (dev-python/certifi-2017.4.17:0/0::gentoo, installed) pulled in by
    
>=dev-python/certifi-2016.9.26[python_targets_pypy(-)?,python_targets_pypy3(-)?,python_targets_python2_7(-)?,python_targets_python3_4(-)?,python_targets_python3_5(-)?,python_targets_python3_6(-)?,-python_single_target_pypy(-),-python_single_target_pypy3(-),-python_single_target_python2_7(-),-python_single_target_python3_4(-),-python_single_target_python3_5(-),-python_single_target_python3_6(-)]
 required by (dev-python/setuptools-36.7.2:0/0::gentoo, installed)

Can anyone else read this mess & advise what to do ?
Perhaps just leave well along ... (smile)

-- 
========================,,============================================
SUPPORT     ___________//___,   Philip Webb
ELECTRIC   /] [] [] [] [] []|   Cities Centre, University of Toronto
TRANSIT    `-O----------O---'   purslowatchassdotutorontodotca


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