Patch #511193: Implement killpg in posixmodule.
diff --git a/pyconfig.h.in b/pyconfig.h.in
index abcdead..0acd1f5 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -459,6 +459,9 @@
 /* Define if you have the kill function.  */
 #undef HAVE_KILL
 
+/* Define if you have the killpg function.  */
+#undef HAVE_KILLPG
+
 /* Define if you have the link function.  */
 #undef HAVE_LINK