From 58910975ad746bf70b4203fcc4b5b42d1f641f59 Mon Sep 17 00:00:00 2001
From: Krasimir Angelov <kr.angelov@gmail.com>
Date: Wed, 26 Oct 2022 07:40:21 +0200
Subject: [PATCH] fix compilation for Python < 3.10

---
 src/runtime/python/pypgf.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/runtime/python/pypgf.c b/src/runtime/python/pypgf.c
index 962c23459..1934ddcc7 100644
--- a/src/runtime/python/pypgf.c
+++ b/src/runtime/python/pypgf.c
@@ -675,7 +675,10 @@ PGF_embed(PGFObject* self, PyObject *modname)
     if (m == NULL)
         return NULL;
 
-    if (PyModule_AddObjectRef(m, "__pgf__", (PyObject*) self) != 0) {
+    Py_INCREF(self);
+    if (PyModule_AddObject(m, "__pgf__", (PyObject*) self) != 0) {
+        Py_DECREF(self);
+        Py_DECREF(m);
         return NULL;
     }