Tonatiuh is a plug-in under Eclipse. To start it, you need to download the source code from the repository. Follow the Subversive installation instruccions to install SVN integration for Eclipse. Then, define Tonatiuh repository by reading Anonymous_Download to anonymous download of Tonatiuh code or reading Upload_to_Repository to download code and upload changes.
First, build Tonatiuh.
In the Project Explorer tab, right click on the Tonatiuh project.
Expand C/C Build and select Environment properties.