+# ------------------------------------------------------------------------------
+have_libidn=no
+AC_ARG_ENABLE(libidn, AS_HELP_STRING([--disable-libidn], [Disable optional LIBIDN support]))
+if test "x$enable_libidn" != "xno"; then
+ PKG_CHECK_MODULES(LIBIDN, [libidn],
+ [AC_DEFINE(HAVE_LIBIDN, 1, [Define if libidn is available])
+ have_libidn=yes
+ M4_DEFINES="$M4_DEFINES -DHAVE_LIBIDN"],
+ [have_libidn=no])
+ if test "x$have_libidn" = "xno" -a "x$enable_libidn" = "xyes"; then
+ AC_MSG_ERROR([*** libidn support requested but libraries not found])
+ fi
+fi
+AM_CONDITIONAL(HAVE_LIBIDN, [test "$have_libidn" = "yes"])
+