Also similar in concept is the <i>tup</i> build system which monitors rule commands run to gain knowledge of additional dependencies.<p><a href="http:&#x2F;&#x2F;gittup.org&#x2F;tup&#x2F;ex_dependencies.html" rel="nofollow">http:&#x2F;&#x2F;gittup.org&#x2F;tup&#x2F;ex_dependencies.html</a>