Because the Numpy sub-packages use '#include "Numeric/arratobject.h", the Numeric package will not build from scratch. This may not matter if one does a 'python setup_all.py install' as long as the base Numeric package is installed before the sub-packages are built. I don't think that this is what setup_all.py does because the core setup.py is called with no arguments. In any case, I'm trying to build RPMs and the build and install processes are seperated. In order to build the packages seprately I am now putting a symbolic link in each package's Include directory called Numeric that points to the Include directory for the core package. I would like to suggest that the core header files be put in a directory 'Include/Numeric' rather than directly in 'Include'. That way the header file locations more acurately mirror the way that they are installed. Tony