--- a/src/s/aix4.h	Mon Aug 13 11:12:06 2007 +0200
+++ b/src/s/aix4.h	Mon Aug 13 11:13:30 2007 +0200
@@ -7,7 +7,20 @@
 
 #ifndef NOT_C_CODE
 #define _XFUNCS_H_ 1
+
+/* AIX is happier when bzero and strcasecmp are declared */
+#include "strings.h"
+
+/* AIX 4.2's sys/mman.h doesn't seem to define MAP_FAILED,
+   although Unix98 claims it must. */
+#ifdef HAVE_MMAP
+#include <sys/mman.h>
+# ifndef MAP_FAILED
+#  define MAP_FAILED ((void *) -1)
+# endif
+#endif
+
 /* Forward declarations for xlc warning suppressions */
 struct ether_addr;
 struct sockaddr_dl;
-#endif
+#endif /* C code */