python: numpy support broken on arch-linux

This seems to be a bug affecting several distros. I testes on Manjaro (fresh and updated live) and Ubuntu 18.04 (docker).

Here is the code for reproducing the bug: https://github.com/luca-penasa/boost-numpy-minimal-bug

it compiles a python module using boost-python and boost-python-numpy the line of code

np::initialize();

causes an error when trying to import the module in python (here from ipython but it is the same from pure python):

Python 3.6.5 (default, May 11 2018, 04:00:52) 
Type 'copyright', 'credits' or 'license' for more information
IPython 6.3.1 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import hello
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
RuntimeError: FATAL: module compiled as little endian, but detected different endianness at runtime
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
ImportError: numpy.core.umath failed to import
---------------------------------------------------------------------------
SystemError                               Traceback (most recent call last)
<ipython-input-1-f81fb083bdeb> in <module>()
----> 1 import hello

SystemError: initialization of hello raised unreported exception

In [2]: 

Could anybody have a look at this? this is making a lot of my code useless!