--- a/src/landscape.h	Sun Oct 14 20:12:51 2007 +0000
+++ b/src/landscape.h	Sun Oct 14 20:16:44 2007 +0000
@@ -25,6 +25,7 @@
 
 uint GetPartialZ(int x, int y, Slope corners);
 uint GetSlopeZ(int x, int y);
+void GetSlopeZOnEdge(Slope tileh, DiagDirection edge, int *z1, int *z2);
 
 static inline Point RemapCoords(int x, int y, int z)
 {