Install libicns-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libicns-dev
Description:
libicns development files
libicns is a library for manipulation of the Mac OS icns resource format, also known as the IconFamily resource type. It can read and write files for the Mac OS X icns format, as well as read from Mac OS resource files and macbinary encoded Mac OS resource forks. . This package contains development files (static libraries and headers) needed to build software using libicns.
Homepage: http://icns.sourceforge.net/
Version: 0.8.1-3.1
Section: universe/libdevel