diff --git a/ChangeLog b/ChangeLog
index 21f99a02..18236ab7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-11-09  Akim Demaille  <demaille@gostai.com>
+
+	Require the generation of parse-gram.output.
+	* src/Makefile.am (YACC): Pass --report=all.
+
 2009-04-06  Joel E. Denny  <jdenny@ces.clemson.edu>
 
 	* NEWS (2.5): New stub.
diff --git a/src/Makefile.am b/src/Makefile.am
index afe6d088..a5cf94ee 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -24,7 +24,7 @@ LDADD = ../lib/libbison.a $(LIBINTL)
 
 # Use our own Bison to build the parser.  Of course, you ought to
 # keep a sane version of Bison nearby...
-YACC = ../tests/bison -y --warnings=all,error
+YACC = ../tests/bison -y --warnings=all,error --report=all
 
 bin_PROGRAMS = bison
 bin_SCRIPTS = $(YACC_SCRIPT)