I have been trying to build a universal SciPy that works, so I can include it in a redistributable application I build with py2app. The one at http://pythonmac.org/packages/py24-fat/index.html is *incomplete*, it contains some dynamic libraries which are ppc only, which is what also happens when I try to build a universal binary myself.Some libs build fine, but some are only a single arch (the native one). The results of for FILE in `find . | grep '\.so'` ; do lipo -info $FILE ; done are: ------------------------------------------------------------------------ ----------- Architectures in the fat file: ./scipy/cluster/_vq.so are: i386 ppc Non-fat file: ./scipy/fftpack/_fftpack.so is architecture: ppc Non-fat file: ./scipy/fftpack/convolve.so is architecture: ppc Non-fat file: ./scipy/integrate/_odepack.so is architecture: ppc Non-fat file: ./scipy/integrate/_quadpack.so is architecture: ppc Non-fat file: ./scipy/integrate/vode.so is architecture: ppc Non-fat file: ./scipy/interpolate/_fitpack.so is architecture: ppc Non-fat file: ./scipy/interpolate/dfitpack.so is architecture: ppc Architectures in the fat file: ./scipy/io/numpyio.so are: i386 ppc Architectures in the fat file: ./scipy/lib/blas/cblas.so are: i386 ppc Non-fat file: ./scipy/lib/blas/fblas.so is architecture: ppc Architectures in the fat file: ./scipy/lib/lapack/atlas_version.so are: i386 ppc Non-fat file: ./scipy/lib/lapack/calc_lwork.so is architecture: ppc Architectures in the fat file: ./scipy/lib/lapack/clapack.so are: i386 ppc Architectures in the fat file: ./scipy/lib/lapack/flapack.so are: i386 ppc Non-fat file: ./scipy/linalg/_flinalg.so is architecture: ppc Non-fat file: ./scipy/linalg/_iterative.so is architecture: ppc Architectures in the fat file: ./scipy/linalg/atlas_version.so are: i386 ppc Non-fat file: ./scipy/linalg/calc_lwork.so is architecture: ppc Architectures in the fat file: ./scipy/linalg/cblas.so are: i386 ppc Architectures in the fat file: ./scipy/linalg/clapack.so are: i386 ppc Non-fat file: ./scipy/linalg/fblas.so is architecture: ppc Non-fat file: ./scipy/linalg/flapack.so is architecture: ppc Architectures in the fat file: ./scipy/linsolve/_csuperlu.so are: i386 ppc Architectures in the fat file: ./scipy/linsolve/_dsuperlu.so are: i386 ppc Architectures in the fat file: ./scipy/linsolve/_ssuperlu.so are: i386 ppc Architectures in the fat file: ./scipy/linsolve/_zsuperlu.so are: i386 ppc Architectures in the fat file: ./scipy/ndimage/_nd_image.so are: i386 ppc Non-fat file: ./scipy/odr/__odrpack.so is architecture: ppc Non-fat file: ./scipy/optimize/_cobyla.so is architecture: ppc Non-fat file: ./scipy/optimize/_lbfgsb.so is architecture: ppc Non-fat file: ./scipy/optimize/_minpack.so is architecture: ppc Architectures in the fat file: ./scipy/optimize/_zeros.so are: i386 ppc Non-fat file: ./scipy/optimize/minpack2.so is architecture: ppc Architectures in the fat file: ./scipy/optimize/moduleTNC.so are: i386 ppc Architectures in the fat file: ./scipy/signal/sigtools.so are: i386 ppc Architectures in the fat file: ./scipy/signal/spline.so are: i386 ppc Non-fat file: ./scipy/sparse/sparsetools.so is architecture: ppc Non-fat file: ./scipy/special/_cephes.so is architecture: ppc Non-fat file: ./scipy/special/specfun.so is architecture: ppc Non-fat file: ./scipy/stats/futil.so is architecture: ppc Non-fat file: ./scipy/stats/mvn.so is architecture: ppc Non-fat file: ./scipy/stats/statlib.so is architecture: ppc Architectures in the fat file: ./scipy/stsci/convolve/_correlate.so are: i386 ppc Architectures in the fat file: ./scipy/stsci/image/_combine.so are: i386 ppc ------------------------------------------------------------------------ ----------- So I didn't pursue this any further for the time being. Since I am not an expert on the SciPy build process, I'm trying to work around this. Instead I took your (Chris') versions from http://trichech.us/? page_id=4 , both ppc and intel SuperPacks. I yanked the scipy dirs out of the packages, and called them scipy-ppc and scipy-i386. Then what I did was lipo the shared libs together, as described on Apple's site: http://developer.apple.com/opensource/buildingopensourceuniversal.html Like so: mv scipy-ppc scipy-universal cd scipy-universal for FILE in `find . | grep '\.so'` ; do file $FILE ; done # shows all ppc libs for LIB in `find . | grep '\.so'` ; do lipo -create $LIB ../scipy- i386/$LIB -output $LIB ; done for FILE in `find . | grep '\.so'` ; do file $FILE ; done # shows all universal libs, yay! cd .. sudo cp -r scipy-universal $PYTHON_SITEPACKAGES/scipy Now this works fine on my G4. I won't have a chance to test on an Intel Mac until later in the week, but this looks promising. Chris, since the package seem to be identical apart from the shared libs, you could probably do this on the SuperPack and only need to distribute one version. Could I also have some advice on how to deal with this sort of stuff. I imagine that much of it is tied up with not having an Apple-blessed Fortran compiler. (Fingers crossed for Leopard). Thanks for all your help everyone, Josh