When trying to emerge dev-haskell/cabal-3.2.1.0-r1, the ebuild fails with the following message: * Messages for package dev-haskell/cabal-3.2.1.0-r1: * Cabal package 'Cabal-3.2.1.0' is shipped with 'PM:8.10.4-r1' ('8.10.4'). * Ebuild author forgot an entry in CABAL_CORE_LIB_GHC_PV='PM:8.10.3 PM:8.10.4 PM:8.10.5 PM:8.10.5-r1 PM:8.10.6 PM:8.10.7 PM:9999'. * Found in /usr/lib64/ghc-8.10.4/package.conf.d.initial. * ERROR: dev-haskell/cabal-3.2.1.0-r1::haskell failed (install phase): * (no error message) * * Call stack: * ebuild.sh, line 127: Called src_install * environment, line 1769: Called haskell-cabal_src_install * environment, line 1455: Called cabal_src_install * environment, line 673: Called cabal-pkg * environment, line 555: Called ghc-install-pkg '/var/tmp/portage/dev-haskell/cabal-3.2.1.0-r1/temp/cabal-3.2.1.0.conf' * environment, line 1291: Called check-for-collisions '/var/tmp/portage/dev-haskell/cabal-3.2.1.0-r1/temp/cabal-3.2.1.0-r1.conf.d' * environment, line 694: Called die * The specific snippet of code: * die; * * If you need support, post the output of `emerge --info '=dev-haskell/cabal-3.2.1.0-r1::haskell'`, * the complete build log and the output of `emerge -pqv '=dev-haskell/cabal-3.2.1.0-r1::haskell'`. * The complete build log is located at '/var/tmp/portage/dev-haskell/cabal-3.2.1.0-r1/temp/build.log'. * The ebuild environment file is located at '/var/tmp/portage/dev-haskell/cabal-3.2.1.0-r1/temp/environment'. * Working directory: '/var/tmp/portage/dev-haskell/cabal-3.2.1.0-r1/work/Cabal-3.2.1.0' * S: '/var/tmp/portage/dev-haskell/cabal-3.2.1.0-r1/work/Cabal-3.2.1.0' output of emerge -pqv '=dev-haskell/cabal-3.2.1.0-r1::haskell' : [ebuild R ] dev-haskell/cabal-3.2.1.0-r1 [3.2.1.0-r1] USE="-doc -hoogle% -hscolour -profile" I can provide additional information if needed. Especially, I cannot post the output of emerge --info yet because it contains urls and I just created my bugzilla account today, but I definitely can add this later if it is helpful. Note: it looks similar to #833848 but with version 3.2.1.0-r1 this time.