diff -urN esound-0.2.39/audio_oss.c esound-0.2.39.new/audio_oss.c
--- esound-0.2.39/audio_oss.c	2008-07-15 18:00:03.000000000 +0200
+++ esound-0.2.39.new/audio_oss.c	2008-07-21 13:17:58.000000000 +0200
@@ -1,4 +1,5 @@
 #include "config.h"
+#include <errno.h>
 
 #ifdef HAVE_MACHINE_SOUNDCARD_H
 #  include <machine/soundcard.h>