Issue #28748: Private variable _Py_PackageContext is now of type "const char *"
rather of "char *".
diff --git a/Include/modsupport.h b/Include/modsupport.h
index 833e33d..39be128 100644
--- a/Include/modsupport.h
+++ b/Include/modsupport.h
@@ -176,7 +176,7 @@
 #endif /* New in 3.5 */
 
 #ifndef Py_LIMITED_API
-PyAPI_DATA(char *) _Py_PackageContext;
+PyAPI_DATA(const char *) _Py_PackageContext;
 #endif
 
 #ifdef __cplusplus