An introduction to the cmake build system. The article is given as a pdf file in the cmake101 directory. The latex sources are also given. License: This article is Copyright (C) 2011 by Ioannis S. Fourkiotis. You are free to distribute this article to anyone you want, so long as you do not charge anything for it, and it is not altered. You must give away the article in its entirety, or not at all.