Install libgnustep-base1.25 by entering the following commands in the terminal:
sudo apt update sudo apt install libgnustep-base1.25
Description:
GNUstep Base library
The GNUstep Base Library is a powerful fast library of general-purpose, non-graphical Objective C classes, inspired by the OpenStep API but implementing Apple and GNU additions to the API as well. It includes for example classes for unicode strings, arrays, dictionaries, sets, byte streams, typed coders, invocations, notifications, notification dispatchers, scanners, tasks, files, networking, threading, remote object messaging support (distributed objects), event loops, loadable bundles, attributed unicode strings, xml, mime, user defaults.
Homepage: http://gnustep.org
Version: 1.25.1-2ubuntu3
Section: universe/libs