From 0b4a653de35ded56fd48dbd65ef9c0ba8da64fb9 Mon Sep 17 00:00:00 2001
From: Nathan Dunfield <nathan@dunfield.info>
Date: Tue, 10 Oct 2023 21:00:10 -0500
Subject: [PATCH] Trying to get it to compile

---
 setup.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/setup.py b/setup.py
index fb9299d7..4b82f849 100644
--- a/setup.py
+++ b/setup.py
@@ -392,6 +392,13 @@ def add(self, source_file, dependency_mod_time=0.0):
         hp_extra_compile_args = ['-mfpmath=sse', '-msse2', '-mieee-fp']
 
 
+if have_cython:
+    if [int(x) for x in cython_version.split('.')[:2]] < [3, 0]:
+        if sys.platform == 'win32':
+            hp_extra_compile_args.append('/DFORCE_C_LINKAGE')
+        else:
+            hp_extra_compile_args.append('-DFORCE_C_LINKAGE')
+
 # SnapPyHP depends implicitly on the source for the main kernel, so we
 # we delete certain object files to force distutils to rebuild them.