libvorbis-ocaml-dev binary package in Ubuntu Focal amd64

 This OCaml library interfaces the vorbis C library. It can be used to
 decode from or encode to the Ogg Vorbis compressed audio format as well
 as to get information about an Ogg Vorbis file.
 .
 Ogg Vorbis is a fully open, non-proprietary, patent-and-royalty-free,
 general-purpose compressed audio format for audio and music at fixed
 and variable bitrates from 16 to 128 kbps/channel.
 .
 This package contains all the development stuff you need to use ocaml-vorbis
 in your programs.

Source package