A fix for this problem has been pulled up into KDE, though implemented
in way not breaking the build for non-NetBSD systems.

$NetBSD: patch-ab,v 1.3 1999/12/06 20:44:57 bouyer Exp $
--- kmix/Makefile.in.orig	Sun Sep 26 02:36:54 1999
+++ kmix/Makefile.in	Sun Sep 26 02:37:38 1999
@@ -286,7 +286,7 @@
 
 kmix: $(kmix_OBJECTS) $(kmix_DEPENDENCIES)
 	@rm -f kmix
-	$(CXXLINK) $(kmix_LDFLAGS) $(kmix_OBJECTS) $(kmix_LDADD) $(LIBS)
+	$(CXXLINK) $(kmix_LDFLAGS) $(kmix_OBJECTS) $(kmix_LDADD) $(LIBS) @LIBOSSAUDIO@
 .cpp.o:
 	$(CXXCOMPILE) -c $<
 .cpp.lo: