--- a/Makefile	Wed Sep 27 16:07:07 2006 +0000
+++ b/Makefile	Wed Sep 27 18:17:01 2006 +0000
@@ -697,6 +697,7 @@
 SRCS += newgrf.c
 SRCS += newgrf_cargo.c
 SRCS += newgrf_engine.c
+SRCS += newgrf_sound.c
 SRCS += newgrf_spritegroup.c
 SRCS += newgrf_station.c
 SRCS += newgrf_text.c