/usr/share/doc/libcmph-dev/README.gz is in libcmph-dev 0.9-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libcmph-dev/../libcmph0/README.gz
/usr/share/doc/libcmph-dev/../libcmph0/README.gz