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Up: [Readme.md ](../Readme.md ), Next: [Section 2 ](sec2.md )
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# Prerequisite and License
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## Prerequisite
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### Gtk4 on a Linux OS
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This tutorial is about Gtk4 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.
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However, this tutorial describes only _C programs on Linux_ .
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If you want to try the examples in the tutorial, you need:
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- PC with Linux distribution like Ubuntu, Debian and so on.
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- Gcc.
- Gtk4.
The stable version of Gtk on Linux distributions is version three at present.
You need to install Gtk4 to your computer.
See [Section 3 ](sec3.md ) for the installation of Gtk4.
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### Ruby and rake for making the document
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This repository includes Ruby programs.
They are used to make Markdown files, HTML files, Latex files and a PDF file.
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You need:
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- Linux distribution like Ubuntu.
- Ruby programming language.
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There are two ways to install it.
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One is installing the distribution's package.
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The other is using rbenv and ruby-build.
If you want to use the latest version of ruby, use rbenv.
- Rake.
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It is a gem, which is a library written in Ruby.
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You can install it as a package of your distribution or use gem command.
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## License
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Copyright (C) 2020 ToshioCP (Toshio Sekiya)
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Gtk4 tutorial repository contains the tutorial document and software such as converters, generators and controllers.
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All of them make up the 'Gtk4 tutorial' package.
This package is simply called 'Gtk4 tutorial' in the following description.
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'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.
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'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.
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See the [GNU General Public License ](https://www.gnu.org/licenses/gpl-3.0.html ) for more details.
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Up: [Readme.md ](../Readme.md ), Next: [Section 2 ](sec2.md )
