From e9096b3003bdf2811a97907929cf411bbf0996b0 Mon Sep 17 00:00:00 2001
From: Matthias Koeppe <mkoeppe@math.ucdavis.edu>
Date: Mon, 18 Sep 2023 11:52:41 -0700
Subject: [PATCH 1/2] Add pyproject.toml, remove Cython from setup_requires,
 install_requires

---
 pyproject.toml | 2 ++
 setup.py       | 3 ---
 2 files changed, 2 insertions(+), 3 deletions(-)
 create mode 100644 pyproject.toml

diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..e3cff08f
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,2 @@
+[build-system]
+requires = ['setuptools', 'Cython>=0.28']
diff --git a/setup.py b/setup.py
index 37acdfce..83b1463d 100755
--- a/setup.py
+++ b/setup.py
@@ -201,9 +201,6 @@ def run(self):
     long_description=README,
     long_description_content_type='text/x-rst',
     classifiers=classifiers,
-    install_requires=["Cython>=0.28"],
-    setup_requires=["Cython>=0.28"],
-
     ext_modules=extensions,
     packages=["cysignals"],
     package_dir={"": "src"},

From 63d401f8a1ca43bca5d77030524b069f7c1783c4 Mon Sep 17 00:00:00 2001
From: Matthias Koeppe <mkoeppe@math.ucdavis.edu>
Date: Mon, 18 Sep 2023 12:37:41 -0700
Subject: [PATCH 2/2] pyproject.toml, .github/workflows/ci-sage.yml: For now,
 use Cython < 3

---
 .github/workflows/ci-sage.yml | 6 +++---
 pyproject.toml                | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/ci-sage.yml b/.github/workflows/ci-sage.yml
index 71070dbc..bf55c2ff 100644
--- a/.github/workflows/ci-sage.yml
+++ b/.github/workflows/ci-sage.yml
@@ -111,7 +111,7 @@ jobs:
         choco install make autoconf gcc-core gcc-g++ python3${{ matrix.python-version }}-devel --source cygwin
     - name: install dependencies
       run: |
-        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && python3.${{ matrix.python-version }} -m pip install setuptools cysignals Cython Sphinx flake8'
+        C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && python3.${{ matrix.python-version }} -m pip install setuptools cysignals 'Cython<3' Sphinx flake8'
     - name: install
       run: |
         C:\\tools\\cygwin\\bin\\bash -l -x -c 'export PATH=/usr/local/bin:/usr/bin && cd $(cygpath -u "$GITHUB_WORKSPACE") && python3.${{ matrix.python-version }} setup.py build_ext -i'
@@ -241,7 +241,7 @@ jobs:
     - name: Install dependencies
       run: |
           python -m pip install --upgrade pip
-          pip install setuptools Cython Sphinx flake8
+          pip install setuptools 'Cython<3' Sphinx flake8
     - name: Freeze pip
       run: |
           pip freeze
@@ -354,7 +354,7 @@ jobs:
     - name: Install dependencies
       run: |
           python -m pip install --upgrade pip
-          pip install setuptools Cython Sphinx flake8
+          pip install setuptools 'Cython<3' Sphinx flake8
     - name: Freeze pip
       run: |
           pip freeze
diff --git a/pyproject.toml b/pyproject.toml
index e3cff08f..341910bb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,2 +1,2 @@
 [build-system]
-requires = ['setuptools', 'Cython>=0.28']
+requires = ['setuptools', 'Cython>=0.28, <3']