--- a/Makefile	Mon Dec 04 13:57:04 2006 +0000
+++ b/Makefile	Mon Dec 04 14:27:54 2006 +0000
@@ -735,6 +735,7 @@
 SRCS += newgrf_cargo.c
 SRCS += newgrf_config.c
 SRCS += newgrf_engine.c
+SRCS += newgrf_gui.c
 SRCS += newgrf_sound.c
 SRCS += newgrf_spritegroup.c
 SRCS += newgrf_station.c