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要用sass，需要ruby2.0以上版本

ubuntu升级ruby到2.1

1.安装前更新：

sudo apt-get -y update
sudo apt-get install cmake
sudo apt-get install -y build-essential zlib1g-dev libyaml-dev libssl-dev libgdbm-dev libreadline-dev
   libncurses5-dev libffi-dev curl git-core openssh-server redis-server postfix checkinstall libxml2-dev 
  libxslt-dev libcurl4-openssl-dev libicu-dev mysql-client libmysqlclient-dev libreadline6-dev

2.下载并安装ruby：

cd ruby-2.1.2
./configure
make
sudo make install

Ubuntu编译ruby

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原文地址：http://www.cnblogs.com/acgpiano/p/5380255.html