I am really sorry to be landing on the mailing list with Atlas build issues. I usually manage be myself to build Atlas, but this time I have been fighting for a couple of days with little success. The reason I need to build Atlas is that our work computers are stuck on Mandriva 2008.0, in which the version of Atlas packaged by the system is not usable. Anyhow, I lost quite a while with Atlas 3.9.26, for which I was never able to build libaries that could be used in a '.so' (seemed that the -fPIC was not working, but really I don't understand what was going on in the maze of makefiles). After that I switched to 3.9;25, which I have already have gotten working on another system (Mandriva 2008, but 32 bits). Know everything builds, but I get a missing symbol at the import: from numpy.linalg import lapack_lite ImportError: /volatile/varoquau/dev/numpy/numpy/linalg/lapack_lite.so: undefined symbol: zgesdd_ I don't have g77 installed on the system at all, to avoid gfortran/g77 mixups. I am attaching the stout of 'python setup.py build_ext -i', in case it contains useful information. Would anybody have suggestions with regards to what I am doing wrong? Cheers, Ga�l