Move to python 3.9 from 3.8: make.conf: PYTHON_TARGETS="python3_8 python3_9 python3_10" PYTHON_SINGLE_TARGET="python3_8" # emerge --depclean # emerge --color=y --update --deep --with-bdeps=y --newuse @world # emerge --depclean change make.conf: PYTHON_TARGETS="python3_8 python3_9 python3_10" PYTHON_SINGLE_TARGET="python3_9" # emerge --depclean # emerge --color=y --update --deep --with-bdeps=y --newuse @world # emerge --depclean change make.conf: PYTHON_TARGETS="python3_9 python3_10" PYTHON_SINGLE_TARGET="python3_9" # emerge --depclean # emerge --color=y --update --deep --with-bdeps=y --newuse @world # emerge --depclean Now you'll have a conflict: Calculating dependencies... done! WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict: dev-libs/libxml2:2 (dev-libs/libxml2-2.9.12:2/2::gentoo, ebuild scheduled for merge) USE="ipv6 python readline -debug -examples -icu -lzma -static-libs -test -verify-sig" ABI_X86="(64) -32 (-x32)" PYTHON_TARGETS="python3_9 -python3_7 -python3_8" conflicts with <dev-libs/libxml2-2.9.12 required by (dev-python/lxml-4.6.3:0/0::gentoo, installed) USE="threads -doc -examples -test" ABI_X86="(64)" PYTHON_TARGETS="python3_9 (-pypy3) (-python3_10) -python3_7 -python3_8" ^ ^^^^^^ >>> Auto-cleaning packages... >>> No outdated packages were found on your system. # emerge --unmerge dev-libs/libxml2:2 dev-python/lxml-4.6.3:0 # emerge @preserved-rebuild Builds dev-libs/libxml2-2.9.12:2 and recompiles all dependencies as expected. afterwards: # emerge --color=y --update --deep --with-bdeps=y --newuse @world recompiles dev-libs/libxml2 replacing dev-libs/libxml2-2.9.12:2 with dev-libs/libxml2-2.9.10-r5 and installing dev-python/lxml-4.6.3 again. Bringing up the conflict again: Calculating dependencies... done! WARNING: One or more updates/rebuilds have been skipped due to a dependency conflict: dev-libs/libxml2:2 (dev-libs/libxml2-2.9.12:2/2::gentoo, ebuild scheduled for merge) USE="ipv6 python readline -debug -examples -icu -lzma -static-libs -test -verify-sig" ABI_X86="(64) -32 (-x32)" PYTHON_TARGETS="python3_9 -python3_7 -python3_8" conflicts with <dev-libs/libxml2-2.9.12 required by (dev-python/lxml-4.6.3:0/0::gentoo, installed) USE="threads -doc -examples -test" ABI_X86="(64)" PYTHON_TARGETS="python3_9 (-pypy3) (-python3_10) -python3_7 -python3_8" ^ ^^^^^^ >>> Auto-cleaning packages... >>> No outdated packages were found on your system. package.use: >=dev-libs/openssl-1.0.2l -bindist >=media-libs/libglvnd-1.3.1 X >=sys-apps/util-linux-2.36.2:0 caps tty-helpers static-libs >=sys-block/open-iscsi-0.0.0 infiniband rdma systemd tcp >=sys-boot/grub-0.0.0 device-mapper doc efiemu fonts libzfs mount nls sdl >=sys-fs/quota-0.0.0 rpc >=sys-libs/ntdb-0.0.0 python >=sys-libs/tdb-1.3.8 python >=sys-libs/tevent-0.9.28 python >=x11-libs/cairo-1.14.2 X >=x11-libs/gdk-pixbuf-2.32.3 X >=x11-libs/libdrm-2.4.104 libkms video_cards_vmware video_cards_amdgpu package.accept_keywords: >=app-benchmarks/bootchart2-0.14.8 ~amd64 >=app-emulation/open-vm-tools-10.1.15 ~amd64 >=app-portage/unsymlink-lib-9 ~amd64 >=dev-libs/xerces-c-3.2.2 ~amd64 >=dev-libs/xml-security-c-1.7.3 ~amd64 >=media-libs/mesa-20.1.0 ~amd64 >=net-fs/nfs-utils-2.4.3 ~amd64 >=sys-apps/iproute2-5.7.0 ~amd64 >=sys-devel/gcc-6.4.0 ~amd64 >=sys-fs/ufsutils-8.2_p3 ~amd64 >=sys-fs/zfs-0.7.7 ~amd64 >=sys-fs/zfs-kmod-0.7.7 ~amd64 >=sys-kernel/genkernel-4.0.0 ~amd64 >=sys-kernel/git-sources-4.6_rc4 ~amd64 >=sys-kernel/spl-0.7.7 ~amd64 >=sys-kernel/vanilla-sources-4.5.2 ~amd64 >=x11-libs/libdrm-2.4.105 ~amd64
This isn't related to Python 3.8 or Python 3.9 and is the result of an incompatibility between lxml and the new libxml2. Just ignore the message for now. *** This bug has been marked as a duplicate of bug 790737 ***
