diff -rupN ZynAddSubFX-2.4.0.old/src/Makefile.inc ZynAddSubFX-2.4.0/src/Makefile.inc
--- ZynAddSubFX-2.4.0.old/src/Makefile.inc 2009-07-15 15:48:41.000000000 -0400
+++ ZynAddSubFX-2.4.0/src/Makefile.inc 2009-08-06 00:52:56.000000000 -0400
@@ -29,9 +29,9 @@ LINUX_MIDIIN=ALSA
#parameters (run 'zynaddsubfx --help' for help)
#LINUX_AUDIOOUT=OSS_AND_JACK
-LINUX_AUDIOOUT=OSS
+#LINUX_AUDIOOUT=OSS
#LINUX_AUDIOOUT=NONE
-#LINUX_AUDIOOUT=JACK
+LINUX_AUDIOOUT=JACK
#LINUX_AUDIOOUT=JACK_RT JACK_RT support is broken
#for PortAudio (PA)
#LINUX_AUDIOOUT=PA