--- gperf-3.0.1/src/positions.h.gcc4	2005-08-02 15:07:31.000000000 +0200
+++ gperf-3.0.1/src/positions.h	2005-08-02 15:11:13.000000000 +0200
@@ -26,6 +26,8 @@
 #ifndef positions_h
 #define positions_h 1
 
+class PositionIterator;
+class PositionReverseIterator;
 /* This class denotes a set of byte positions, used to access a keyword.  */
 
 class Positions