libcegui-mk2-dev 0.8.7-5ubuntu1 (arm64 binary) in ubuntu focal

 CEGUI is a free library providing windowing and widgets for graphics
 APIs and engines where such functionality is not natively available
 or is severely lacking. The library is written in C++, is object
 oriented, and is primarily targeted at games developers who should be
 spending their time creating great games, not building GUI sub-systems
 .
 This package contains the development files for the CEGUI library.