-- Fix license format in pyproject.toml and lower setuptools requirement.
-- The original pyproject.toml incorrectly used a string for the license field
-- and required a very recent setuptools version not yet in the ports tree.

--- pyproject.toml.orig 2026-06-05 04:25:53 UTC

+++ pyproject.toml
@@ -4,8 +4,7 @@ authors = [{ name = "Matt Swain", email = "m.swain@me.
 description = "A simple Python wrapper around the PubChem PUG REST API."
 readme = "README.md"
 authors = [{ name = "Matt Swain", email = "m.swain@me.com" }]
-license = "MIT"
-license-files = ["LICENSE"]
+license = { text = "MIT" }
 requires-python = ">=3.10"
 dependencies = []
 keywords = ["pubchem", "python", "rest", "api", "chemistry", "cheminformatics"]
@@ -56,7 +55,7 @@ py-modules = ["pubchempy"]
 py-modules = ["pubchempy"]
 
 [build-system]
-requires = ["setuptools>=77.0.3"]
+requires = ["setuptools>=63.1.0"]
 build-backend = "setuptools.build_meta"
 
 [tool.pytest.ini_options]