AC_DEFUN([AC_FUNC_RES_SEARCH], [
  ac_cv_func_res_search=no
  AC_TRY_LINK([
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#ifdef HAVE_ARPA_NAMESER_COMPAT_H
#include <arpa/nameser_compat.h>
#endif
#include <resolv.h>],
  [
const char host[11]="openafs.org";
u_char ans[1024];
int r;
res_init();
/* Capture result in r but return 0, since a working nameserver is
 * not a requirement for compilation.
 */
r =  res_search( host, C_IN, T_MX, (u_char *)&ans, sizeof(ans));
return 0;
  ],
  ac_cv_func_res_search=yes)
])