--- lib/fixedsizehash.h	2015-08-21 14:22:37.000000000 +0200
+++ lib/fixedsizehash.h	2015-11-20 05:05:45.648028916 +0100
@@ -30,12 +30,12 @@
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/cdefs.h>
 #include <sys/param.h>
 
 #include <system.h>
 
-#define CONCAT(t1,t2) __CONCAT (t1,t2)
+#define CONCAT1(x,y) x##y
+#define CONCAT(x,y) CONCAT1(x,y)
 
 /* Before including this file the following macros must be defined: