Gentoo's Bugzilla –
Attachment 591076 Details for
Bug 695642dev-util/lldb-9.0.0 with app-doc/doxygen-1.8.15[clang] after unmerging sys-devel/clang-8.0.1: /usr/sbin/doxygen: error while loading shared libraries: libclang.so.8: cannot open shared object file: No such file or directory