https://bugs.gentoo.org/943962
--- a/id_query.c
+++ b/id_query.c
@@ -33,7 +33,7 @@
 
 int id_query (ident_t *id, int lport, int fport, struct timeval *timeout)
 {
-    RETSIGTYPE (*old_sig)();
+    RETSIGTYPE (*old_sig)(int sig);
     int res;
     char buf[80];
     fd_set ws;