--- sched.h    2002-01-08 15:42:43 +0000
+++ sched.h    2007-03-19 19:09:31 +0000
@@ -1,3 +1,5 @@
+#ifndef _shed_h
+#define _shed_h
 /* Copyright (c) 1993-2002
  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
@@ -41,3 +43,4 @@
 #define EV_READ        1
 #define EV_WRITE    2
 #define EV_ALWAYS    3
+#endif