diff --git a/ChangeLog b/ChangeLog
index e822da413b..34ec06b9b9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+Thu Dec 20 02:23:22 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* enc/Makefile.in (RM): added.
+
+	* enc/depend (encs): sort in alpha-numeric order.
+
+	* enc/depend (clean, distclean): added.
+
 Thu Dec 20 01:10:52 2007  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* compile.c (iseq_compile_each): should handle upper level eval iseq
diff --git a/enc/Makefile.in b/enc/Makefile.in
index 792fb9fc21..6cb9789976 100644
--- a/enc/Makefile.in
+++ b/enc/Makefile.in
@@ -24,3 +24,5 @@ XLDFLAGS = @XLDFLAGS@ $(EXTLDFLAGS)
 LIBS = @LIBS@ $(EXTLIBS)
 LDSHARED = @LDSHARED@
 DLDFLAGS = @DLDFLAGS@ $(EXTLDFLAGS) @ARCH_FLAG@
+
+RM = @RM@
diff --git a/enc/depend b/enc/depend
index de0e092a00..f5eeafe9dc 100644
--- a/enc/depend
+++ b/enc/depend
@@ -1,4 +1,6 @@
-! encs = (Dir.open($srcdir) {|d| d.grep(/.+\.c\z/)} - BUILTIN_ENCS).each {|e| e.chomp!(".c")}
+! encs = Dir.open($srcdir) {|d| d.grep(/.+\.c\z/)} - BUILTIN_ENCS
+! encs.each {|e| e.chomp!(".c")}
+! encs = encs.sort_by {|e| e.split(/(\d+)/).map {|n| Integer(n) rescue n}}
 
 VPATH = <% %w[$(arch_hdrdir)/ruby $(hdrdir)/ruby $(top_srcdir) $(srcdir)].join(CONFIG["PATH_SEPARATOR"]) %>
 
@@ -22,3 +24,10 @@ $(ENCSODIR)/<%e%>.$(DLEXT): <%e%>.$(OBJEXT)
 ! encs.each do |e|
 <%e%>.$(OBJEXT): <%e%>.c
 ! end
+
+clean:
+	$(RM) $(ENCSOS)
+	$(RM) $(ENCOBJS)
+
+distclean: clean
+	$(RM) enc.mk