dxpc(1) on Linux
The text 85f37cec5a4a, as Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.
Differential X Protocol Compressor
Flags it lists
-
-d -
-f -
-k -
-l -
-p -
-t -
-u -
-v -
-w