From 3a742ef393b16b92be3784f390e3c194310f5c08 Mon Sep 17 00:00:00 2001
From: Thomas A Caswell <tcaswell@gmail.com>
Date: Tue, 5 Feb 2019 21:43:25 -0500
Subject: [PATCH] Backport PR #25145: BLD: pin cython language level to '2'

---
 setup.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/setup.py b/setup.py
index ed2d905f4358b..52a67f147121c 100755
--- a/setup.py
+++ b/setup.py
@@ -450,7 +450,8 @@ def run(self):
 # Note: if not using `cythonize`, coverage can be enabled by
 # pinning `ext.cython_directives = directives` to each ext in extensions.
 # github.com/cython/cython/wiki/enhancements-compilerdirectives#in-setuppy
-directives = {'linetrace': False}
+directives = {'linetrace': False,
+              'language_level': 2}
 macros = []
 if linetrace:
     # https://pypkg.com/pypi/pytest-cython/f/tests/example-project/setup.py