Index: trunk/src/undo.c
===================================================================
--- trunk/src/undo.c	(revision 8282)
+++ trunk/src/undo.c	(revision 8283)
@@ -1653,7 +1653,7 @@
 	return buff;
 }
 
-void undo_dump()
+void undo_dump(void)
 {
 	size_t n;
 	int last_serial = -2;
Index: trunk/src_plugins/diag/diag.c
===================================================================
--- trunk/src_plugins/diag/diag.c	(revision 8282)
+++ trunk/src_plugins/diag/diag.c	(revision 8283)
@@ -218,6 +218,7 @@
 }
 
 #ifndef NDEBUG
+extern void undo_dump(void);
 static const char dump_undo_syntax[] = "dumpfonts()\n";
 static const char dump_undo_help[] = "Print info about fonts";
 static int pcb_act_DumpUndo(int argc, const char **argv, pcb_coord_t x, pcb_coord_t y)