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# Contributing to ANTLR 4

1. [Fork](https://help.github.com/articles/fork-a-repo) the [antlr/antlr4 repo](https://github.com/antlr/antlr4)
2. Install and configure [EditorConfig](http://editorconfig.org/) so your text editor or IDE uses the ANTLR 4 coding style
3. [Build ANTLR 4](doc/building-antlr.md)
4. [Run the ANTLR project unit tests](doc/antlr-project-testing.md)
5. Create a [pull request](https://help.github.com/articles/using-pull-requests/) including your change


**Note:** You must sign the `contributors.txt` certificate of origin with your pull request if you've not done so before.