make the given path to --with-libidn override any other installation

       AC_MSG_RESULT(no)

       ;;

  *)   AC_MSG_RESULT(yes)

       AC_CHECK_LIB(idn, idna_to_ascii_lz, ,

                    [

                    dnl if there was a given path, try it

                    nolibidn="true"

       idn=""

       dnl if there is a given path, check that FIRST

       if test "x$LIBIDN" != "xyes"; then

                      nolibidn="" dnl reset to test again

          oldLDFLAGS=$LDFLAGS

          oldCPPFLAGS=$CPPFLAGS

          LDFLAGS="$LDFLAGS -L$LIBIDN/lib"

          CPPFLAGS="$CPPFLAGS -I$LIBIDN/include"

          idn="yes"

          AC_CHECK_LIB(idn, idna_to_ascii_4i, ,

                                   nolibidn="true"

                       idn=""

                       LDFLAGS=$oldLDFLAGS

                       CPPFLAGS=$oldCPPFLAGS)

       fi

                    ])

       if test "x$nolibidn" != "xtrue"; then

       if test "x$idn" != "xyes"; then

          dnl check with default paths

          AC_CHECK_LIB(idn, idna_to_ascii_lz, ,

                       idn="")

       fi

       if test "x$idn" = "xyes"; then

         curl_idn_msg="enabled"

         dnl different versions of libidn have different setups of these:

         AC_CHECK_FUNCS( idn_free idna_strerror )