Just now I have tried to manually set PYTHON_TARGETS="python2_7 python3_6" PYTHON_SINGLE_TARGET="python3_6"
in /etc/portage/make.conf and got the following error: # emerge --update --deep --with-bdeps=y --newuse --backtrack=120 --ask world These are the packages that would be merged, in order: Calculating dependencies... done! !!! The ebuild selected to satisfy "app-text/asciidoc" has unmet requirements. - app-text/asciidoc-8.6.10::gentoo USE="-examples -graphviz -highlight -test" ABI_X86="(64)" PYTHON_SINGLE_TARGET="(-pypy) -python2_7" PYTHON_TARGETS="python2_7 (-pypy)" The following REQUIRED_USE flag constraints are unsatisfied: exactly-one-of ( python_single_target_pypy python_single_target_python2_7 ) The above constraints are a subset of the following complete expression: exactly-one-of ( python_single_target_pypy python_single_target_python2_7 ) python_single_target_pypy? ( python_targets_pypy ) python_single_target_python2_7? ( python_targets_python2_7 ) (dependency required by "app-text/dvisvgm-2.1.3::gentoo" [installed]) (dependency required by "app-text/texlive-2017::gentoo[extra]" [installed]) (dependency required by "@selected" [set]) (dependency required by "@world" [argument]) which is similar to those errors I got while trying to set PYTHON_TARGETS="python2_7 python3_5" PYTHON_SINGLE_TARGET="python3_5" before switching yesterday from python-3.5 to python-3.6 target. Does it mean that setting python targets in /etc/portage/make.conf is not supported any more? P.S. Currently my system is up-to-date and already switched to python-3.6 targets.