fix building without threads (closes #23877)
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index bab3a2f..e564549 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -1299,8 +1299,12 @@
         return;
 
 display_stack:
+#ifdef WITH_THREAD
     /* PyGILState_GetThisThreadState() works even if the GIL was released */
     tstate = PyGILState_GetThisThreadState();
+#else
+    tstate = PyThreadState_GET();
+#endif
     if (tstate == NULL) {
         /* _Py_DumpTracebackThreads() requires the thread state to display
          * frames */