libatk1.0-dev 2.35.1-1ubuntu2 (amd64 binary) in ubuntu focal

 ATK is a toolkit providing accessibility interfaces for applications or
 other toolkits. By implementing these interfaces, those other toolkits or
 applications can be used with tools such as screen readers, magnifiers, and
 other alternative input devices.
 .
 These are the development files for ATK, needed for compilation of
 programs or toolkits which use it.