$OpenBSD: patch-layout_build_Makefile_in,v 1.4 2011/06/28 05:43:57 landry Exp $
https://bugzilla.mozilla.org/show_bug.cgi?id=648726
--- layout/build/Makefile.in.orig	Fri May 27 18:12:15 2011
+++ layout/build/Makefile.in	Tue May 31 22:18:25 2011
@@ -285,6 +285,9 @@ ifdef MOZ_SYDNEYAUDIO
 ifeq ($(OS_ARCH),Linux)
 EXTRA_DSO_LDOPTS += $(MOZ_ALSA_LIBS)
 endif
+ifeq ($(OS_ARCH),OpenBSD)
+EXTRA_DSO_LDOPTS += -lsndio
+endif
 ifeq ($(OS_ARCH),Darwin)
 OS_LIBS += -framework CoreAudio -framework AudioToolbox -framework AudioUnit -framework Carbon -framework IOKit
 endif