Mart Raudsepp: >Maybe there is just an old ruby:2.1 SLOT installed, that hasn't been >properly depcleaned?
Indeed. i5-64 /home/hafi # emerge -p -c [...] dev-lang/ruby selected: 2.1.9 protected: none omitted: 2.2.9 [...] After depclean, which required another @preserved-rebuild, a successful one, I replaced the the now preserved_libs_registry with the problematic old one. This time there was no problem. i5-64 /home/hafi # emerge -q @preserved-rebuild >>> Verifying ebuild manifests >>> Emerging (1 of 1) net-ftp/gftp-2.0.19-r3::gentoo >>> Installing (1 of 1) net-ftp/gftp-2.0.19-r3::gentoo :) Hartmut