brew安装sshpass

有以下解决方法：

# 1
brew install https://raw.githubusercontent.com/kadwanev/bigboybrew/master/Library/Formula/sshpass.rb
# 2
brew install http://git.io/sshpass.rb

或者新建一个文件/tmp/sshpass.rb，写入如下内容，最后执行brew install /tmp/sshpass.rb

require 'formula'

class Sshpass < Formula
  url 'http://sourceforge.net/projects/sshpass/files/sshpass/1.05/sshpass-1.05.tar.gz'
  homepage 'http://sourceforge.net/projects/sshpass'
  sha256 'c3f78752a68a0c3f62efb3332cceea0c8a1f04f7cf6b46e00ec0c3000bc8483e'

  def install
    system "./configure", "--disable-debug", "--disable-dependency-tracking",
                          "--prefix=#{prefix}"
    system "make install"
  end

  def test
    system "sshpass"
  end
end