Fix numpy py3.9 dep

JacobHayes · JacobHayes · commit 601ef97c6585 · 2021-04-23T13:20:37.000-04:00
diff --git a/pyproject.toml b/pyproject.toml
@@ -3,4 +3,10 @@ requires-python = ">=3.6"
 
 [build-system]
 build-backend = "setuptools.build_meta"
-requires = ["numpy==1.19.0", "setuptools", "wheel"]
+# 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'",
+    "oldest-supported-numpy",
+    "setuptools",
+    "wheel"
+]
