Error when running pypi2nix command

[aaveshV]

Description

<detailed description of error # Traceback

% pypi2nix --version
% pypi2nix -e numpy
Collecting setuptools<49.2.0,>=40.9.0
  File was already downloaded /private/tmp/tmp7c1io2bm/downloads/setuptools-49.1.3.zip
Successfully downloaded setuptools
Looking in links: /tmp/tmp7c1io2bm/downloads, /tmp/tmp7c1io2bm/wheels
Processing /private/tmp/tmp7c1io2bm/downloads/setuptools-49.1.3.zip
Processing /private/tmp/tmp7c1io2bm/downloads/wheel-0.35.1.tar.gz
Processing /private/tmp/tmp7c1io2bm/downloads/Cython-0.29.21.tar.gz
Processing /private/tmp/tmp7c1io2bm/downloads/numpy-1.19.2.zip
  Installing build dependencies: started
  Installing build dependencies: finished with status 'done'
  Getting requirements to build wheel: started
  Getting requirements to build wheel: finished with status 'done'
    Preparing wheel metadata: started
    Preparing wheel metadata: finished with status 'done'
Building wheels for collected packages: setuptools, wheel, Cython, numpy
  Building wheel for setuptools (setup.py): started
  Building wheel for setuptools (setup.py): finished with status 'done'
  Created wheel for setuptools: filename=setuptools-49.1.3-py3-none-any.whl size=789534 sha256=be345deb4e8301833379e7ebb9f5927041b17d8e2d8c118f14c6e617af07705d
  Stored in directory: /private/tmp/tmp7c1io2bm/cache/wheels/99/d0/37/d23b931c3287dd3bf147782acd32f41273a16b5fac88ced4bc
  Building wheel for wheel (setup.py): started
  Building wheel for wheel (setup.py): finished with status 'done'
  Created wheel for wheel: filename=wheel-0.35.1-py2.py3-none-any.whl size=32318 sha256=ce979572a5f7542e3b5753891a3871b5f1415a061039132afd4cdea694eb6e02
  Stored in directory: /private/tmp/tmp7c1io2bm/cache/wheels/ea/84/69/a97ddb369e35963849820ad2e73c7de6bcb104665873357902
  Building wheel for Cython (setup.py): started
  Building wheel for Cython (setup.py): finished with status 'done'
  Created wheel for Cython: filename=Cython-0.29.21-cp38-cp38-macosx_10_12_x86_64.whl size=1927558 sha256=0150bf6c7101d407e59b0e8f5d955877b65024c315e5707b7f91c354c4033427
  Stored in directory: /private/tmp/tmp7c1io2bm/cache/wheels/30/5d/de/c692550ac5acc4e10e884dd6468638c9b8995cbfff98c55b99
  Building wheel for numpy (PEP 517): started
  Building wheel for numpy (PEP 517): finished with status 'error'
Successfully built setuptools wheel Cython
Failed to build numpy