diff --git a/ChangeLog b/ChangeLog
index 2e9c303aec..188b4f714c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Mon Jun  9 21:13:51 2008  Koichi Sasada  <ko1@atdot.net>
+Mon Jun  9 21:17:26 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* enc/depend (clean): remove build directories.
 
 	* test_knownbug.rb -> KNOWNBUGS.rb: renamed.
 
diff --git a/enc/depend b/enc/depend
index 212daf1b6d..ff95d8f068 100644
--- a/enc/depend
+++ b/enc/depend
@@ -59,3 +59,7 @@ enc/trans/transdb.$(OBJEXT): transdb.h
 
 clean:
 	@$(RM) $(ENCSOS) $(ENCDEFS) $(ENCOBJS) $(TRANSSOS) $(TRANSDEFS) $(TRANSOBJS)
+% %w[$(ENCSODIR)/trans $(ENCSODIR) enc/trans enc].each do|dir|
+%   dir = dir.gsub('/', File::ALT_SEPARATOR) if File::ALT_SEPARATOR
+	@-rmdir <%=dir%>
+% end