scrut(1): without <sysexits.h> fall back to ANSI C

src/scrut.c

@@ -17,9 +17,10 @@
  */
 
 #include <stdio.h> /* fprintf(3), stderr, NULL */
+#include <stdlib.h> /* EXIT_FAILURE */
 #include <string.h> /* strchr(3) */
 #ifndef EX_USAGE
-#	include <sysexits.h>
+#	define EX_USAGE EXIT_FAILURE
 #endif
 #include <unistd.h> /* access(3), getopt(3), F_OK, R_OK, W_OK, X_OK */
 #include <sys/stat.h> /* lstat(3), stat struct, S_ISBLK, S_ISCHR, S_ISDIR,