diff -r 6296dfa53f81 -r e0d09d74e805 src/settings.cpp
--- a/src/settings.cpp	Thu Apr 03 21:01:01 2008 +0000
+++ b/src/settings.cpp	Thu Apr 03 21:54:31 2008 +0000
@@ -51,6 +51,7 @@
 #include "transparency.h"
 #include "textbuf_gui.h"
 #include "string_func.h"
+#include "rail_gui.h"
 #include "gui.h"
 #include "town.h"
 #include "video/video_driver.hpp"
@@ -1404,7 +1405,7 @@
 	SDT_BOOL(Patches, always_small_airport,          0,NN, false,        STR_CONFIG_PATCHES_SMALL_AIRPORTS,      NULL),
 	SDT_BOOL(Patches, enable_signal_gui,             S, 0, false,        STR_CONFIG_PATCHES_ENABLE_SIGNAL_GUI,   NULL),
 	 SDT_VAR(Patches, drag_signals_density,SLE_UINT8,S, 0,  4, 1, 20, 0, STR_CONFIG_PATCHES_DRAG_SIGNALS_DENSITY,NULL),
-	 SDT_VAR(Patches, semaphore_build_before,SLE_INT32, S, NC, 1975, MIN_YEAR, MAX_YEAR, 1, STR_CONFIG_PATCHES_SEMAPHORE_BUILD_BEFORE_DATE, NULL),
+	 SDT_VAR(Patches, semaphore_build_before,SLE_INT32, S, NC, 1975, MIN_YEAR, MAX_YEAR, 1, STR_CONFIG_PATCHES_SEMAPHORE_BUILD_BEFORE_DATE, ResetSignalVariant),
 	SDT_CONDVAR(Patches, town_layout, SLE_UINT8, 59, SL_MAX_VERSION, 0, MS, TL_ORIGINAL, TL_NO_ROADS, NUM_TLS - 1, 1, STR_CONFIG_PATCHES_TOWN_LAYOUT, CheckTownLayout),
 
 	/***************************************************************************/