--- ./libdjvu/GString.h~	2004-08-06 15:11:29.000000000 +0000
+++ ./libdjvu/GString.h		2005-10-12 00:55:01.000000000 +0000
@@ -138,6 +138,10 @@
 # endif
 #endif
 
+class GBaseString; 
+class GUTF8String; 
+class GNativeString; 
+
 // Internal string representation.
 class GStringRep : public GPEnabled
 {