--- a/viewport.h	Sun Aug 15 16:19:54 2004 +0000
+++ b/viewport.h	Sun Aug 15 20:23:42 2004 +0000
@@ -53,6 +53,7 @@
 	VPM_RAILDIRS = 3,
 	VPM_X_AND_Y = 4,
 	VPM_X_AND_Y_LIMITED = 5,
+	VPM_SIGNALDIRS = 6,
 };
 
 void VpSelectTilesWithMethod(int x, int y, int method);