Local pip install works

python/pyproject.toml

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+[build-system]
+requires = [
+    "setuptools>=42",
+    "wheel",
+    "numpy>=1.17.3"
+]
+build-backend = "setuptools.build_meta"

python/pyqmckl/__init__.py

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+from .pyqmckl import *

python/requirements.txt

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+setuptools>=42
+numpy>=1.17.3

python/setup.py

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+#!/usr/bin/env python3
+"""
+setup.py file for pyqmckl package
+"""
+
+from setuptools import setup, Extension
+from os.path import join
+
+with open("README.md", "r") as fh:
+    long_description = fh.read()
+
+mod_name = 'pyqmckl'
+
+
+# Define pyqmckl extension module based on TREXIO source codes + SWIG-generated wrapper
+pyqmckl_module =  Extension(name               = f'{mod_name}._{mod_name}', #f'_{mod_name}',   
+                            #sources            = [ join('src', mod_name + '_wrap.c') ],
+                            sources            = [ join('src', f'{mod_name}.i') ],
+                            #include_dirs       = [numpy_includedir],
+                            #library_dirs       = [],
+                            #runtime_library_dirs = [],
+                            libraries          = ['qmckl'],
+                            extra_compile_args = ['-Wall'],
+                            #extra_link_args    = [h5_ldflags],
+                            swig_opts          = ['-py3'],
+                            depends            = [ join('src', 'qmckl.h') ],
+                            language           = 'c'
+                            )
+
+
+setup(name             = mod_name,
+      version          = '0.2.0',
+      author           = "TREX-CoE",
+      author_email     = "posenitskiy@irsamc.ups-tlse.fr",
+      description      = """Python API of the QMCkl library""",
+      long_description = long_description,
+      long_description_content_type = "text/markdown",
+      ext_modules      = [pyqmckl_module],
+      py_modules       = [mod_name],
+      #package_dir      = {"" : "src"},
+      packages         = ['pyqmckl'],
+      url              = 'https://github.com/TREX-CoE/qmckl',
+      license          = 'BSD',
+      classifiers=[
+         "Intended Audience :: Science/Research",
+         "Intended Audience :: Developers",
+         "Topic :: Scientific/Engineering",
+         "Programming Language :: C",
+         "Programming Language :: Python",
+         "Programming Language :: Python :: 3",
+         "Programming Language :: Python :: 3 :: Only",
+         "Programming Language :: Python :: Implementation :: CPython",
+         "License :: OSI Approved :: BSD License",
+         "Operating System :: POSIX",
+         "Operating System :: Unix",
+         "Operating System :: MacOS"
+      ],
+      python_requires = ">=3.0",
+      install_requires = ['numpy>=1.17.3']
+      )