[SciPy-user] Numpy/Scipy on AIX

David Cournapeau david@ar.media.kyoto-u.ac...
Mon Jul 30 00:27:34 CDT 2007

Pearu Peterson wrote:
> David Cournapeau wrote:
>> scipy cannot compile lapack by itself.
> yes, it can. Just define env. variables BLAS_SRC, LAPACK_SRC
> pointing to blas, lapack source directories, respectively.
> If there are some blas or lapack libraries lying
> around in the system  then one must also set BLAS=None, LAPACK=None, 
> ATLAS=None so that numpy.distutils will not pick up the unwanted libraries.
Wow, I didn't see this feature while I packaged scipy. Sorry for the 
>> There is a pretty good chance that the LAPACK you compiled has something 
>> wrong: LAPACK is difficult to compile correctly when you want to use it 
>> in a non Fortran environment; at least it is on Linux. Did you test LAPACK ?
>> LAPACK 3.1.1 causes problems with scipy at the moment, too, so I 
>> recommend you to compile the version 3.0 (beware though, you should NOT 
>> use the BLAS from LAPACK 3.0, because it is buggy). If I were you, I 
>> would do this first: compile LAPACK 3.0 with the AIX BLAS, and compile 
>> the testers and run them (doing a make lapack_testing should be enough).
> I have fixed the problems with LAPACK 3.1.1 recently. Just use numpy
> from SVN and scipy should compile fine with LAPACK 3.1.1.
Do all the tests pass now ? As far as I remembered (but this was a few 
months ago), building with LAPACK 3.1.1 is possible, but some tests 
fail. I don't have the time right now to recompile my own lapack to 
reproduce the problem, but I can do it within the new few days if you 
need more precise informations.


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