As a fall-out of a GNU Autotools conversion I am currently working on I made an overview graph of the files and tools involved with an GNU Autotools-bases project. The filled, grey ellipses are tools you need to have installed. All other ellipses represent files specific to the related Autotools project.

The above image is licensed under Creative Commons Attribution-Share Alike 3.0 and can be re-generated by Neato 2.16 of GraphViz when fed with this source file.