--- builtins/psize.c.orig	2005-07-10 11:31:07.000000000 +0200
+++ builtins/psize.c	2005-07-10 11:31:21.000000000 +0200
@@ -40,7 +40,9 @@
 #include "../command.h"
 #include "../general.h"
 #include "../sig.h"
+#ifndef (errno)
 extern int errno;
+#endif
 
 int nw;