OK, I answer my own topic, because I found a solution in the forum... after a fair number of hours.

The answer to how do I add a compilation option to an existing distribution of pyindi-client is, go in setup.py file and edit the section (red color edit):

pyindi_module = Extension('_PyIndi',
sources=,
language='c++',
extra_compile_args=[ '-std=c++11'],
extra_objects = [join(libindipath, 'libindiclient.a')]

That worked perfectly in my case.

Cheers,

Remi

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