This package fails to compile on an unstable system. Attached relevant logs and emerge --info
Created attachment 708660 [details] emerge_info emerge --info
Created attachment 708663 [details] ceph-16.2.4:20210514-220353.log.xz build log (compressed because it exceeds attachment limit, use 'xzless' to read it)
Installing: /var/tmp/notmpfs/portage/sys-cluster/ceph-16.2.4/image/usr/bin/rgw-orphan-list CMake Error at doc/man/8/cmake_install.cmake:46 (file): file INSTALL cannot find "/var/tmp/notmpfs/portage/sys-cluster/ceph-16.2.4/work/ceph-16.2.4_build/doc/man/ceph-syn.8": No such file or directory. Call Stack (most recent call first): doc/man/cmake_install.cmake:47 (include) doc/cmake_install.cmake:47 (include) cmake_install.cmake:49 (include) Makefile:70: *** [install] error 1
Sphinx undid the change: https://bugs.gentoo.org/789531#c5