+t_oldLibs="$LIBS"
+LIBS="$LIBS"
+ac_cv_var__res_options=no
+AC_TRY_LINK([#include <sys/types.h>
+ #include <sys/socket.h>
+ #include <netinet/in.h>
+ #include <arpa/nameser.h>
+ #include <resolv.h>],
+ [_res.options = RES_INIT;],
+ ac_cv_var__res_options=yes);
+if test "$ac_cv_var__res_options" != "yes"; then
+ LIBRESOLV="-lresolv"
+fi
+LIBS="$t_oldLibs"
+
+if test "x$LIBRESOLV" = "x"; then
+ AC_CHECK_LIB(resolv, res_query, [LIBRESOLV=-lresolv])
+ LIBS="$t_oldLibs"
+fi
+AC_SUBST(LIBRESOLV)
+
+LIBS="$LIBS $LIBRESOLV"
+