diff -r 04591f9a4173 -r 48962802d168 src/lemon/preflow.h
--- a/src/lemon/preflow.h	Wed Nov 10 19:59:14 2004 +0000
+++ b/src/lemon/preflow.h	Wed Nov 10 20:14:32 2004 +0000
@@ -22,6 +22,7 @@
 
 #include <lemon/invalid.h>
 #include <lemon/maps.h>
+#include <lemon/graph_utils.h>
 
 /// \file
 /// \ingroup flowalgs