int
JACKAudioBackend::get_port_property (PortHandle port, const std::string& key, std::string& value, std::string& type) const
{
-#ifndef NO_JACK_METADATA // really everyone ought to have this by now.
+#ifdef HAVE_JACK_METADATA // really everyone ought to have this by now.
int rv = -1;
char *cvalue = NULL;
char *ctype = NULL;