+DEPLIBS=$LIBS AC_SUBST(DEPLIBS)
+BRES_LIBEXEC="bres" BRES_SOURCE="bres"
+AC_SUBST(BRES_LIBEXEC) AC_SUBST(BRES_SOURCE)
+AC_ARG_WITH(adns,
+[ --with-adns use ADNS library for background name resolution],
+[want_adns=$withval], [want_adns=auto])
+if test $want_adns != no; then
+ save_LIBS=$LIBS
+ LIBS=$DEPLIBS
+ mdw_CHECK_MANYLIBS(adns_init, adns, [have_adns=yes], [have_adns=no])
+ DEPLIBS=$LIBS
+ LIBS=$save_LIBS
+ if test $have_adns = yes; then
+ AC_DEFINE(HAVE_ADNS)
+ BRES_LIBEXEC=""
+ BRES_SOURCE="bres-adns"
+ elif test $want_adns = yes; then
+ AC_MSG_ERROR([ADNS library not found, but explicitly requested])
+ fi
+fi
+