diff -r 5678f72103c5 configure.ac
--- a/configure.ac	Mon Oct 16 01:06:53 2006 +0400
+++ b/configure.ac	Mon Oct 16 01:05:06 2006 +0400
@@ -43,7 +43,6 @@ darwin*)
 *)
   darwin=no
   PKG_CHECK_MODULES(ALSA, alsa >= 0.9.0)
-  AC_DEFINE(MIDI_ALSA, 1, [Define for ALSA MIDI support on Linux])
   ;;
 esac
 AM_CONDITIONAL(DARWIN, test x$darwin = xyes)
@@ -57,10 +56,17 @@ AC_SUBST(JACK_LIBS)
 AC_SUBST(JACK_LIBS)
 
 dnl Check for JACK MIDI support
+AC_ARG_WITH(jackmidi,AC_HELP_STRING([--with-jackmidi], [default=yes]),
+	[ if test $withval = "yes";then with_jack_midi=yes;
+		else with_jack_midi=no; fi ])
+if test x${with_jack_midi} = 'xyes'; then
 AC_CHECK_LIB(jack, jack_midi_port_get_info,
              [with_jack_midi=yes
               AC_DEFINE(MIDI_JACK, 1, [Define for JACK MIDI support])],
              with_jack_midi=no, $JACK_LIBS)
+else if test x${darwin} = 'xno'; then
+	AC_DEFINE(MIDI_ALSA, 1, [Define for ALSA MIDI support on Linux])
+fi fi
 AM_CONDITIONAL(MIDI_JACK, test x$with_jack_midi = xyes)
 
 dnl Use lotsa flags if we have gcc.