$NetBSD: patch-configure.in,v 1.1 2019/10/13 19:52:47 maya Exp $

--- configure.in.orig	2017-04-10 02:31:02.000000000 +0000
+++ configure.in
@@ -2836,6 +2836,12 @@ AC_TRY_RUN(
   AC_MSG_RESULT(cross-compiling); AC_DEFINE(HAVE_LU, 1, [Define if you have %lu support])
 )
 
+dnl Test for blacklistd support
+AC_CHECK_LIB(blacklist, blacklist,
+  [AC_DEFINE(HAVE_BLACKLIST, 1, [Define if you have blacklistd support.])
+  ac_build_addl_libs="$ac_build_addl_libs -lblacklist"
+  ])
+
 dnl Add the proftpd support library
 LIBS="-lsupp $LIBS"