diff --git a/sample/build-zlib-ruby b/sample/build-zlib-ruby
deleted file mode 100755
index d9f3b805..00000000
--- a/sample/build-zlib-ruby
+++ /dev/null
@@ -1,44 +0,0 @@
-#!/usr/bin/env ruby
-
-# sample/build-zlib-ruby - build script for zlib and ruby
-#
-# Copyright (C) 2012 Tanaka Akira  <akr@fsij.org>
-# 
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions are met:
-# 
-#  1. Redistributions of source code must retain the above copyright notice, this
-#     list of conditions and the following disclaimer.
-#  2. Redistributions in binary form must reproduce the above copyright notice,
-#     this list of conditions and the following disclaimer in the documentation
-#     and/or other materials provided with the distribution.
-#  3. The name of the author may not be used to endorse or promote products
-#     derived from this software without specific prior written permission.
-# 
-# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
-# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
-# EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
-# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
-# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
-# OF SUCH DAMAGE.
-
-require 'chkbuild'
-
-# resource limits
-word_bytes = [nil].pack("p").length
-ChkBuild.limit(:cpu => 3600*4) # seconds
-ChkBuild.limit(:stack => 1024*1024*10*word_bytes) # bytes
-ChkBuild.limit(:data => 1024*1024*500*word_bytes) # bytes
-ChkBuild.limit(:as => 1024*1024*500*word_bytes) # bytes
-
-zlib = ChkBuild::Zlib.def_target()
-
-ChkBuild::Ruby.def_target(
-  %w[trunk],
-  zlib)
-
-ChkBuild.main