allegro4-doc binary package in Ubuntu Focal arm64

 This package contains the Allegro documentation in various formats,
 FAQs and other documentation about the Allegro library and the
 source of the example programs.
 .
 Allegro is a cross-platform library mainly aimed at video game and multimedia
 programming. It handles common, low-level tasks such as creating windows,
 accepting user input, loading data, drawing images, playing sounds, etc. and
 generally abstracting away the underlying platform.

Source package