--- a/Makefile	Mon Mar 06 20:28:28 2006 +0000
+++ b/Makefile	Mon Mar 06 20:55:24 2006 +0000
@@ -700,6 +700,7 @@
 SRCS += train_cmd.c
 SRCS += train_gui.c
 SRCS += tree_cmd.c
+SRCS += tunnel_map.c
 SRCS += tunnelbridge_cmd.c
 SRCS += unmovable_cmd.c
 SRCS += vehicle.c