Index: ee.c
--- ee.c.orig	2010-05-20 05:40:49.000000000 +0200
+++ ee.c	2010-05-20 20:44:41.000000000 +0200
@@ -545,6 +545,10 @@
 #endif /* HAS_STDLIB */
 #endif /* __STDC__ */
 
+#ifndef SIGUNUSED
+#define SIGUNUSED 255
+#endif
+
 int
 main(argc, argv)		/* beginning of main program		*/
 int argc;