Fix CI and add pyproject.toml to declare build time deps

.circleci/config.yml

@@ -34,7 +34,7 @@ jobs:
           name: Build package under test and check for PyPI compliance via twine
           command: |
             . venv/bin/activate
-            pip install twine
+            pip install twine --only-binary=cryptography
             python setup.py sdist
             twine check dist/`ls dist/ | grep .tar.gz`
       - run:

MANIFEST.in

@@ -1,5 +1,6 @@
 include README.rst
 include LICENSE
 recursive-include LICENSES *
+include pyproject.toml
 include glmnet/*.pyf
 exclude glmnet/*.c

dev-requirements.txt

@@ -1,5 +1,5 @@
 # Pin exact dependency version numbers for local dev and CircleCI.
-numpy==1.19.0
+numpy==1.19.2
 pytest==5.4.3
 scikit-learn==0.23.1
 scipy==1.5.0

pyproject.toml

@@ -0,0 +1,14 @@
+[project]
+requires-python = ">=3.6"
+
+[build-system]
+build-backend = "setuptools.build_meta"
+# We need at least 1.19.0 for ABI compatibility, but otherwise prefer the oldest available wheel (eg: 1.19.3 for py3.9)
+requires = [
+    "numpy==1.19.0; python_version<'3.9'",
+    "numpy==1.19.3; python_version=='3.9'",
+    "numpy==1.22.4; python_version=='3.10'",
+    "numpy; python_version>'3.10'",
+    "setuptools",
+    "wheel"
+]