+# Do we have res_init, for detecting changes in /etc/resolv.conf?
+
+resolv=no
+AC_TRY_LINK([#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <resolv.h>],
+ [return res_init();],
+ have_res_init=yes, have_res_init=no)
+if test "$have_res_init" = no; then
+ OLIBS="$LIBS"
+ LIBS="$LIBS -lresolv"
+ AC_MSG_CHECKING(for res_init with -lresolv)
+ AC_TRY_LINK([#include <netinet/in.h>
+#include <arpa/nameser.h>
+#include <resolv.h>],
+ [return res_init();],
+ have_res_init=yes, have_res_init=no)
+ AC_MSG_RESULT($have_res_init)
+ if test "$have_res_init" = yes ; then
+ resolv=yes
+ fi
+ LIBS="$OLIBS"
+fi
+
+if test "$have_res_init" = yes; then
+ AC_DEFINE(HAVE_RES_INIT, 1, [Define to 1 if res_init is available.])
+fi
+