I've been running for a while with older versions of numpy and scipy, but I now need to provide a Universal Binary version of my app for distribution. I'm running a G4 with 10.4.8. I have installed the universal versions of Python, Numpy, SciPy, matplotlib, etc from http://pythonmac.org/packages/py24-fat/ I get an error when importing scipy, as follows: ImportError: Failure linking new module: /Library/Frameworks/ Python.framework/Versions/2.4/lib/python2.4/site-packages/scipy/ special/_cephes.so: Symbol not found: _printf$LDBLStub Referenced from: /Library/Frameworks/Python.framework/Versions/2.4/ lib/python2.4/site-packages/scipy/special/_cephes.so Expected in: dynamic lookup My understanding is that this is a common error when a package is built with GCC 4, but this shouldn't crop up in a downloadable package. Where are instructions for building SciPy as a universal binary? Obviously it is being done, but I would like to know how to do it myself. The wiki would be a good spot for this to go. As a second issue, running the following command: for FILE in `find . | grep "\.so"` ; do file $FILE ; done (which gives the architecture for all the dynamic libraries) shows that only a few of the libraries are Universal. The output is attached below. ./cluster/_vq.so: Mach-O fat file with 2 architectures ./cluster/_vq.so (for architecture ppc): Mach-O bundle ppc ./cluster/_vq.so (for architecture i386): Mach-O bundle i386 ./fftpack/_fftpack.so: Mach-O bundle ppc ./fftpack/convolve.so: Mach-O bundle ppc ./integrate/_odepack.so: Mach-O bundle ppc ./integrate/_quadpack.so: Mach-O bundle ppc ./integrate/vode.so: Mach-O bundle ppc ./interpolate/_fitpack.so: Mach-O bundle ppc ./interpolate/dfitpack.so: Mach-O bundle ppc ./io/numpyio.so: Mach-O fat file with 2 architectures ./io/numpyio.so (for architecture ppc): Mach-O bundle ppc ./io/numpyio.so (for architecture i386): Mach-O bundle i386 ./lib/blas/cblas.so: Mach-O fat file with 2 architectures ./lib/blas/cblas.so (for architecture ppc): Mach-O bundle ppc ./lib/blas/cblas.so (for architecture i386): Mach-O bundle i386 ./lib/blas/fblas.so: Mach-O bundle ppc ./lib/lapack/atlas_version.so: Mach-O fat file with 2 architectures ./lib/lapack/atlas_version.so (for architecture ppc): Mach-O bundle ppc ./lib/lapack/atlas_version.so (for architecture i386): Mach-O bundle i386 ./lib/lapack/calc_lwork.so: Mach-O bundle ppc ./lib/lapack/clapack.so: Mach-O fat file with 2 architectures ./lib/lapack/clapack.so (for architecture ppc): Mach-O bundle ppc ./lib/lapack/clapack.so (for architecture i386): Mach-O bundle i386 ./lib/lapack/flapack.so: Mach-O fat file with 2 architectures ./lib/lapack/flapack.so (for architecture i386): Mach-O bundle i386 ./lib/lapack/flapack.so (for architecture ppc): Mach-O bundle ppc ./linalg/_flinalg.so: Mach-O bundle ppc ./linalg/_iterative.so: Mach-O bundle ppc ./linalg/atlas_version.so: Mach-O fat file with 2 architectures ./linalg/atlas_version.so (for architecture ppc): Mach-O bundle ppc ./linalg/atlas_version.so (for architecture i386): Mach-O bundle i386 ./linalg/calc_lwork.so: Mach-O bundle ppc ./linalg/cblas.so: Mach-O fat file with 2 architectures ./linalg/cblas.so (for architecture ppc): Mach-O bundle ppc ./linalg/cblas.so (for architecture i386): Mach-O bundle i386 ./linalg/clapack.so: Mach-O fat file with 2 architectures ./linalg/clapack.so (for architecture ppc): Mach-O bundle ppc ./linalg/clapack.so (for architecture i386): Mach-O bundle i386 ./linalg/fblas.so: Mach-O bundle ppc ./linalg/flapack.so: Mach-O bundle ppc ./linsolve/_csuperlu.so: Mach-O fat file with 2 architectures ./linsolve/_csuperlu.so (for architecture ppc): Mach-O bundle ppc ./linsolve/_csuperlu.so (for architecture i386): Mach-O bundle i386 ./linsolve/_dsuperlu.so: Mach-O fat file with 2 architectures ./linsolve/_dsuperlu.so (for architecture ppc): Mach-O bundle ppc ./linsolve/_dsuperlu.so (for architecture i386): Mach-O bundle i386 ./linsolve/_ssuperlu.so: Mach-O fat file with 2 architectures ./linsolve/_ssuperlu.so (for architecture ppc): Mach-O bundle ppc ./linsolve/_ssuperlu.so (for architecture i386): Mach-O bundle i386 ./linsolve/_zsuperlu.so: Mach-O fat file with 2 architectures ./linsolve/_zsuperlu.so (for architecture ppc): Mach-O bundle ppc ./linsolve/_zsuperlu.so (for architecture i386): Mach-O bundle i386 ./ndimage/_nd_image.so: Mach-O fat file with 2 architectures ./ndimage/_nd_image.so (for architecture ppc): Mach-O bundle ppc ./ndimage/_nd_image.so (for architecture i386): Mach-O bundle i386 ./optimize/_cobyla.so: Mach-O bundle ppc ./optimize/_lbfgsb.so: Mach-O bundle ppc ./optimize/_minpack.so: Mach-O bundle ppc ./optimize/_zeros.so: Mach-O fat file with 2 architectures ./optimize/_zeros.so (for architecture ppc): Mach-O bundle ppc ./optimize/_zeros.so (for architecture i386): Mach-O bundle i386 ./optimize/minpack2.so: Mach-O bundle ppc ./optimize/moduleTNC.so: Mach-O fat file with 2 architectures ./optimize/moduleTNC.so (for architecture ppc): Mach-O bundle ppc ./optimize/moduleTNC.so (for architecture i386): Mach-O bundle i386 ./signal/sigtools.so: Mach-O fat file with 2 architectures ./signal/sigtools.so (for architecture ppc): Mach-O bundle ppc ./signal/sigtools.so (for architecture i386): Mach-O bundle i386 ./signal/spline.so: Mach-O fat file with 2 architectures ./signal/spline.so (for architecture ppc): Mach-O bundle ppc ./signal/spline.so (for architecture i386): Mach-O bundle i386 ./sparse/sparsetools.so: Mach-O bundle ppc ./special/_cephes.so: Mach-O bundle ppc ./special/specfun.so: Mach-O bundle ppc ./stats/futil.so: Mach-O bundle ppc ./stats/mvn.so: Mach-O bundle ppc ./stats/statlib.so: Mach-O bundle ppc ./weave/examples/fibonacci_ext.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), not stripped ./weave/examples/ramp_ext.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), not stripped