diff --git a/lwlib/ChangeLog b/lwlib/ChangeLog
index c8435eb562f..7e332a9fd5d 100644
--- a/lwlib/ChangeLog
+++ b/lwlib/ChangeLog
@@ -1,3 +1,8 @@
+2011-06-27  YAMAMOTO Mitsuharu  <mituharu@math.s.chiba-u.ac.jp>
+
+	* Makefile.in (ALL_CFLAGS): Add -I../lib for generated header files
+	in out-of-tree build.
+
 2011-06-06  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* Makefile.in (ALL_CFLAGS): Add -I$(srcdir)/../lib.
diff --git a/lwlib/Makefile.in b/lwlib/Makefile.in
index fe6bbc31282..1193cee4110 100644
--- a/lwlib/Makefile.in
+++ b/lwlib/Makefile.in
@@ -56,7 +56,7 @@ ALL_CFLAGS= $(C_SWITCH_SYSTEM) $(C_SWITCH_X_SITE) \
   $(C_SWITCH_X_SYSTEM) $(C_SWITCH_MACHINE) \
   $(C_WARNINGS_SWITCH) $(PROFILING_CFLAGS) $(CFLAGS) \
   -DHAVE_CONFIG_H -Demacs -I../src \
-  -I$(srcdir) -I$(srcdir)/../src -I$(srcdir)/../lib
+  -I$(srcdir) -I$(srcdir)/../src -I../lib -I$(srcdir)/../lib
 
 .c.o:
 	$(CC) -c $(CPPFLAGS) $(ALL_CFLAGS) $<