Given : AIX 5.3 xlf v10.1 python 2.5 numpy 1.0.1 Task: Building/installaing numpy on AIX 5.3 Problem: The install process can not determine the IBM Fortran compiler Running python ./numpy/distutils/fcompiler/ibm.py gives pretty much garbage on the screen and the resolut is 'None' . So i changed the line in ./numpy/distutils/fcompiler/ibm.py from 'version_cmd' : ["xlf"], to 'version_cmd' : ["xlf -qversion"], since xlf v10 supports the option where xlf v8 does not. Now running python ./numpy/distutils/fcompiler/ibm.py gives me: customize IbmFCompiler Couldn't match compiler version for 'IBM XL Fortran Enterprise Edition V10.1 for AIX \nVersion: 10.01.0000.0004' None Could anybody give me a solution/hint since i do not know what else has to be changed to make a match. BTW: I am not a python programmer. I just try to build numpy. Tia Hajo