While the PR probably solves this - there is a 'bug' in pandas (I expect) that prevents me from completing the test - as, I expect LONG before the .cpp source is to be compiled - there is a error because a wrong flag is passed to the compiler (-Wno-unused-function) and the build stops.

Have not had the time to disect pandas so that I can get a .cpp source compiled.

+++++
Successfully installed pip-18.1
root@x066:[/data/prj/python/git/kadler]pip list
/opt/lib/python3.8/site-packages/pip/_vendor/html5lib/_trie/_base.py:3: DeprecationWdeprecated, and in 3.8 it will stop working
  from collections import Mapping
Package    Version
---------- -------
pip        18.1
setuptools 39.0.1
root@x066:[/data/prj/python/git/kadler]pip install numpy
/opt/lib/python3.8/site-packages/pip/_vendor/html5lib/_trie/_base.py:3: DeprecationWdeprecated, and in 3.8 it will stop working
  from collections import Mapping
Collecting numpy
/opt/lib/python3.8/site-packages/pip/_vendor/msgpack/fallback.py:220: PendingDepreca
  warnings.warn(
  Using cached https://files.pythonhosted.org/packages/2d/80/1809de155bad674b494248b
Installing collected packages: numpy
  Running setup.py install for numpy ... done
Successfully installed numpy-1.15.4

...
Installing collected packages: six, python-dateutil, pytz, pandas
...
    copying pandas/io/formats/templates/html.tpl -> build/lib.aix-6.1-3.8-pydebug/pandas/io/formats/templates
    UPDATING build/lib.aix-6.1-3.8-pydebug/pandas/_version.py
    set build/lib.aix-6.1-3.8-pydebug/pandas/_version.py to '0.23.4'
    running build_ext
    building 'pandas._libs.algos' extension
    creating build/temp.aix-6.1-3.8-pydebug
    creating build/temp.aix-6.1-3.8-pydebug/pandas
    creating build/temp.aix-6.1-3.8-pydebug/pandas/_libs
    xlc_r -O -I/opt/include -O2 -qmaxmem=-1 -qarch=pwr5 -I/opt/include -O2 -qmaxmem=-1 -qarch=pwr5 -Ipandas/_libs/src/klib -Ipandas/_libs/src -I/opt/lib/python3.8/site-packages/numpy/core/include -I/opt/include/python3.8dm -c pandas/_libs/algos.c -o build/temp.aix-6.1-3.8-pydebug/pandas/_libs/algos.o -Wno-unused-function
    xlc_r: 1501-210 (S) command option Wno-unused-function contains an incorrect subargument
    error: command 'xlc_r' failed with exit status 40

    ----------------------------------------
Command "/opt/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-install-xnscgehv/pandas/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-record-0w46p413/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-install-xnscgehv/pandas/