-- Work around FreeBSD's older setuptools not yet supporting PEP 639 `license-files` / SPDX license expression.
-- This patch lowers the setuptools requirement and rewrites the license field to the older free-text form.

--- pyproject.toml.orig	2026-10-21 08:59:13 UTC
+++ pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools>=77", "setuptools-scm>=8"]
+requires = ["setuptools>=61", "setuptools-scm>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]
@@ -7,8 +7,7 @@ readme = "README.md"
 description = "Optimised tools for group-indexing operations: aggregated sum and more."
 dynamic = ["version"]
 readme = "README.md"
-license = "BSD-2-Clause"
-license-files = ["LICENSE.txt"]
+license = {text = "BSD-2-Clause"}
 authors = [
     {name = "Michael Löffler", email = "ml@occam.com.ua"},
     {name = "Daniel Manson", email = "danielmanson.uk@gmail.com"}