From b3525e2a970ae3e783665040b1e0db5fc3391327 Mon Sep 17 00:00:00 2001
From: Jose Zapater <jzapater@gmail.com>
Date: Mon, 2 Nov 2020 09:46:17 +0100
Subject: [PATCH] Build failure with python 3.9

Signed-off-by: Jose Zapater <jzapater@gmail.com>
---
 hardware/plugins/DelayedLink.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hardware/plugins/DelayedLink.h b/hardware/plugins/DelayedLink.h
index c90a7d8e69..cb71478685 100644
--- a/hardware/plugins/DelayedLink.h
+++ b/hardware/plugins/DelayedLink.h
@@ -14,6 +14,17 @@
 #include <frameobject.h>
 #include "../../main/Helper.h"
 
+#ifndef _Py_DEC_REFTOTAL
+  /* _Py_DEC_REFTOTAL macro has been removed from Python 3.9 by:
+    https://github.com/python/cpython/commit/49932fec62c616ec88da52642339d83ae719e924 */
+#  ifdef Py_REF_DEBUG
+#    define _Py_DEC_REFTOTAL _Py_RefTotal--
+#  else
+#    define _Py_DEC_REFTOTAL
+#    define _Py_Dealloc
+#  endif
+#endif
+
 #if PY_VERSION_HEX >= 0x030800f0
 static inline void
 py3__Py_DECREF(const char *filename, int lineno, PyObject *op)