diff --git a/ChangeLog b/ChangeLog
index 372bd2195b..8fd16f295d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Mar 17 21:42:54 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* tool/make-snapshot (package): creates .revision.time and passes
+	  CHDIR to create prerequisite files.
+
 Tue Mar 17 18:00:55 2009  Akinori MUSHA  <knu@iDaemons.org>
 
 	* enumerator.c (Enumerator#{each_,}{with_index,with_object}): Fix
diff --git a/tool/make-snapshot b/tool/make-snapshot
index 6f564a62ee..45b6c51efc 100755
--- a/tool/make-snapshot
+++ b/tool/make-snapshot
@@ -108,6 +108,7 @@ def package(rev, destdir)
     v = v[0]
   end
   open("#{v}/revision.h", "wb") {|f| f.puts "#define RUBY_REVISION #{revision}"}
+  open("#{v}/.revision.time", "wb") {}
   version ||= (versionhdr = IO.read("#{v}/version.h"))[RUBY_VERSION_PATTERN, 1]
   version or return
   if patchlevel
@@ -159,7 +160,7 @@ def package(rev, destdir)
       FileUtils.mkpath(hdrdir = "#{extout}/include/ruby")
       File.open("#{hdrdir}/config.h", "w") {}
       miniruby = ENV['MINIRUBY'] + " -rcross"
-      IO.popen("make -f - prereq srcdir=. IFCHANGE=tool/ifchange 'MINIRUBY=#{miniruby}' 'RUBY=#{ENV["RUBY"]}'", "w") do |f|
+      IO.popen("make -f - prereq srcdir=. CHDIR=cd IFCHANGE=tool/ifchange 'MINIRUBY=#{miniruby}' 'RUBY=#{ENV["RUBY"]}'", "w") do |f|
         f.puts(IO.read("Makefile.in").gsub(/^@.*\n/, '').gsub(/@([A-Za-z_]\w*)@/) {ENV[$1]})
         f.puts(commonmk.gsub(/\{[^{}]*\}/, ""))
       end