ap_scan is not supported on OpenBSD.

Index: wpa_supplicant/scan.c
--- wpa_supplicant/scan.c.orig
+++ wpa_supplicant/scan.c
@@ -869,6 +869,15 @@ static void wpa_supplicant_scan(void *eloop_ctx, void 
 		wpas_notify_ap_scan_changed(wpa_s);
 	}
 
+#ifdef __OpenBSD__
+	if (wpa_s->conf->ap_scan != 0) {
+		wpa_dbg(wpa_s, MSG_DEBUG, "Using OpenBSD - "
+			"overriding ap_scan configuration");
+		wpa_s->conf->ap_scan = 0;
+		wpas_notify_ap_scan_changed(wpa_s);
+	}
+#endif
+
 	if (wpa_s->conf->ap_scan == 0) {
 		wpa_supplicant_gen_assoc_event(wpa_s);
 		return;