--- configure.ac.orig	2019-06-07 06:21:39 UTC
+++ configure.ac
@@ -153,6 +153,7 @@ AC_ARG_ENABLE(kx509, 
 if test "$enable_kx509" != no ;then
 	AC_DEFINE([KX509], 1, [Define to enable kx509.])
 fi
+AM_CONDITIONAL(KX509, test "$enable_kx509" != no)
 
 dnl Need to test if pkg-config exists
 PKG_PROG_PKG_CONFIG