librados-dev 13.2.4+dfsg1-0ubuntu0.18.10.2 (amd64 binary) in ubuntu cosmic

 RADOS is a reliable, autonomic distributed object storage cluster
 developed as part of the Ceph distributed storage system. This is a
 shared library allowing applications to access the distributed object
 store using a simple file-like interface.
 .
 This package contains development files needed for building applications that
 link against librados2.