cl-trivial-gray-streams 20200731.git8e6a1a0-1 (amd64 binary) in ubuntu hirsute

 This system provides an extremely thin compatibility layer for Common Lisp
 gray streams, which provide a standard way for users to define their own
 streams for use by the standard I/O functions.
 .
 Gray streams is an interface proposed for inclusion with ANSI Common Lisp by
 David N. Gray. The proposal did not make it into the standard, but most
 popular Common Lisp implementations implement this facility anyway.
 .
 This system provides an extremely thin compatibility layer for gray
 streams.