Here you find information about the system http://www.fz-juelich.de/jsc/service/sco_ibmP6.

The only way we found to compile numpy is using python2.3 and numpy-1.0.4. The next version numpy-1.1.0 did not work unfortunately. In addition the usage of the generic IBM lapack/blas in numpy does not work, hence one has to use site.cfg:

: diff site.cfg site.cfg.example
< library_dirs =
< include_dirs =
> #library_dirs = /usr/local/lib
> #include_dirs = /usr/local/include

With his change numpy compiles and the installation of ASE and gpaw does not cause problems.