Install gnustep-gui-runtime by entering the following commands in the terminal:
sudo apt update sudo apt install gnustep-gui-runtime
Description:
GNUstep GUI Library - runtime files
The GNUstep GUI Library is a powerful library of graphical user interface classes written completely in the Objective-C language; the classes are based upon the OpenStep specification, and provide the user with a traditional nextstep-like look and feel. . This package contains the runtime support files needed by GNUstep GUI applications.
Homepage: http://gnustep.org
Version: 0.26.2-3
Section: universe/libs