-AC_CHECK_LIB([freeradius-radius], [rad_alloc],,
- AC_MSG_ERROR([required library libfreeradius-radius not found]))
+
+# Enable-knobs.
+AH_TEMPLATE([RS_ENABLE_TLS], [TLS (RadSec) enabled])
+AH_TEMPLATE([RADPROT_TLS], [])
+AC_ARG_ENABLE([tls], AS_HELP_STRING([--enable-tls], [enable TLS (RadSec)]),
+ [AC_CHECK_LIB([event_openssl], [bufferevent_openssl_socket_new],,
+ AC_MSG_ERROR([required library event_openssl not found]))
+ AC_DEFINE([RS_ENABLE_TLS])
+ AC_DEFINE([RADPROT_TLS])])
+AM_CONDITIONAL([RS_ENABLE_TLS], [test "${enable_tls+set}" = set])