Up: [README.md](../README.md), Next: [Section 2](sec2.md) # Prerequisite and License ## Prerequisite ### GTK 4 on a Linux OS This tutorial is about GTK 4 libraries. It is originally used on Linux with C compiler, but now it is used more widely, on Windows and MacOS, with Vala, Python and so on. However, this tutorial describes only _C programs on Linux_. If you want to try the examples in the tutorial, you need: - PC with Linux distribution like Ubuntu, Debian and so on. - Gcc. - GTK 4. The stable version of Gtk on Linux distributions is version three at present. You need to install GTK 4 to your computer. See [Section 3](sec3.md) for the installation of GTK 4. ### Ruby and rake for making the document This repository includes Ruby programs. They are used to make Markdown files, HTML files, Latex files and a PDF file. You need: - Linux distribution like Ubuntu. - Ruby programming language. There are two ways to install it. One is installing the distribution's package. The other is using rbenv and ruby-build. If you want to use the latest version of ruby, use rbenv. - Rake. It is a gem, which is a library written in Ruby. You can install it as a package of your distribution or use gem command. ## License Copyright (C) 2020 ToshioCP (Toshio Sekiya) Gtk4-tutorial repository contains the tutorial document and software such as converters, generators and controllers. All of them make up the 'Gtk4-tutorial' package. This package is simply called 'Gtk4-tutorial' in the following description. 'Gtk4-tutorial' is free; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License or, at your option, any later version. 'Gtk4-tutorial' is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the [GNU General Public License](https://www.gnu.org/licenses/gpl-3.0.html) for more details. Up: [README.md](../README.md), Next: [Section 2](sec2.md)