Given: AIX 5.3 xlc v8 xlf v10 essl v4.2 Build and installed: numpy 1.0.4 Build and installed: lapack 3.1.1 with CCI and essl support Task: Trying to build scipy 0.6.0 Error: Get the following error which seems to be numpy related: ... ... File "/usr/local/lib/python2.5/site-packages/numpy/distutils/ccompiler.py", line 303, in CCompiler_cxx_compiler + cxx.linker_so[2:] TypeError: can only concatenate list (not "str") to list ... Current Solution: Changed line 303 in /usr/local/lib/python2.5/site-packages/numpy/distutils/ccompiler.py from: ... cxx.linker_so = [cxx.linker_so[0]] + cxx.compiler_cxx[0] \ + cxx.linker_so[2:] ... to ... cxx.linker_so = [cxx.linker_so[0]] + [cxx.compiler_cxx[0]] \ + cxx.linker_so[2:] ... Is that change OK for the logic ? Must be a bug report opened for that ? BTW: Has somebody build scipy for AIX 5.3 with the xlc & xlf compilers ? If yes - Could she/he provide some information regarding the requirements tia Hajo