Use oldest-supported-numpy for building #57
Merged
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Noticed a problem that Eigency currently uses latest NumPy for building, however, it should use oldest supported NumPy version. Noticed it while debugging segmentation fault in a project using Eigency, it turned out that Eigency is built against latest NumPy from pip (right now 1.23.3), however, if system/venv has older NumPy, it can lead to crash due to ABI incompatibility (system/venv Numpy version must be always the same or greater than NumPy used for building).
More detailed and clearer explanation is at NumPy webpage:
https://numpy.org/doc/stable/user/depending_on_numpy.html#adding-a-dependency-on-numpy
This pull request changes the behavior to use oldest-supported-numpy as suggested by NumPy documentation.