get prototypes for malloc/exit/strcpy
  
  Patch by Mike Frysinger <vapier@gentoo.org>
  
  --- a/dhry.h
  +++ b/dhry.h
  @@ -388,6 +388,8 @@
   /* General definitions: */
   
   #include <stdio.h>
  +#include <stdlib.h>
  +#include <string.h>
                   /* for strcpy, strcmp */
   
   #define Null 0