--- dime-0.20030921.orig/include/dime/entities/Vertex.h
+++ dime-0.20030921/include/dime/entities/Vertex.h
@@ -34,6 +34,8 @@
 #include <dime/entities/Entity.h>
 #include <dime/util/Linear.h>
 
+class dimePolyline;
+
 class DIME_DLL_API dimeVertex : public dimeEntity
 {
   friend class dimePolyline;