From the buildout 2.1.1 docs on pypi: python The name of a section containing information about the default Python interpreter. Recipes that need a installation typically have options to tell them which Python installation to use. By convention, if a section-specific option isn't used, the option is looked for in the buildout section. The option must point to a section with an executable option giving the path to a Python executable. By default, the buildout section defines the default Python as the Python used to run the buildout. Is the above still relevant? I am trying to build a custom python using zc.recipe.cmmi and use the interpreter in other parts, like in: http://goo.gl/ufWwT But, that simply does not work. Regards, Joe -- Joe Steeve HiPro IT Solutions Private Limited http://hipro.co.in/