Index: hosts/jack_compat.h
===================================================================
--- hosts/jack_compat.h	(revision 426)
+++ hosts/jack_compat.h	(working copy)
@@ -45,6 +45,15 @@
 
 #define jack_midi_event_get jack_midi_event_get_compat
 
+void
+jack_midi_clear_buffer_compat(
+  void * port_buffer)
+{
+  jack_midi_clear_buffer(port_buffer, 0);
+}
+
+#define jack_midi_clear_buffer jack_midi_clear_buffer_compat
+
 #else
 
 #if defined(HAVE_OLD_JACK_MIDI)
Index: hosts/lv2_jack_host.c
===================================================================
--- hosts/lv2_jack_host.c	(revision 426)
+++ hosts/lv2_jack_host.c	(working copy)
@@ -294,8 +294,13 @@
 			for (uint32_t i=0; i < event_count; ++i) {
 				lv2midi_get_event(&state, &timestamp, &size, &data);
 
+#if defined(JACK_MIDI_NEEDS_NFRAMES)
 				jack_midi_event_write(jack_buffer,
+                              (jack_nframes_t)timestamp, data, size, nframes);
+#else
+				jack_midi_event_write(jack_buffer,
 						(jack_nframes_t)timestamp, data, size);
+#endif
 
 				lv2midi_increment(&state);
 			}