I emerge python3.4 set as active:
eselect python list
Available Python interpreters:
[1] python2.7
[2] python3.3
[3] python3.4 *
but it still complain
[ebuild U ] sys-apps/portage-2.2.20.1 [2.2.14]
PYTHON_TARGETS="python3_4* -python3_3*"
!!! Multiple package instances within a single package slot have been
pulled
!!! into the dependency graph, resulting in a slot conflict:
sys-apps/portage:0
(sys-apps/portage-2.2.20.1:0/0::gentoo, ebuild scheduled for merge)
pulled in by
sys-apps/portage (Argument)
(sys-apps/portage-2.2.14:0/0::gentoo, installed) pulled in by
sys-apps/portage[python_targets_python2_7(-)?,python_targets_python3_3(-)?,-python_single_target_python2_7(-),-python_single_target_python3_3(-)]
required by (app-admin/webapp-config-1.52-r1:0/0::gentoo, installed)
sys-apps/portage[python_targets_python2_7(-)?,python_targets_python3_3(-)?,python_targets_python3_4(-)?,python_targets_pypy(-)?,-python_single_target_python2_7(-),-python_single_target_python3_3(-),-python_single_target_python3_4(-),-python_single_target_pypy(-)]
required by (app-portage/gentoolkit-0.3.0.9-r2:0/0::gentoo, installed)
What is it looking for?