compass是一个css样式框架。通过ruby gem可以安装它。
[sudo] gem install compass

在安装时出现问题如下:

    Fetching: sass-3.4.0.gem (100%)
    Fetching: multi_json-1.10.1.gem (100%)
    Fetching: compass-core-1.0.1.gem (100%)
    Fetching: compass-import-once-1.0.5.gem (100%)
    Fetching: chunky_png-1.3.1.gem (100%)
    Fetching: rb-fsevent-0.9.4.gem (100%)
    Fetching: ffi-1.9.3.gem (100%)
    Building native extensions.  This could take a while...
    ERROR:  Error installing compass:
            ERROR: Failed to build gem native extension.

            /usr/bin/ruby1.9.1 extconf.rb
    /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
            from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
            from extconf.rb:4:in `<main>'


    Gem files will remain installed in /var/lib/gems/1.9.1/gems/ffi-1.9.3 for inspection.
    Results logged to /var/lib/gems/1.9.1/gems/ffi-1.9.3/ext/ffi_c/gem_make.out

查了一下解决办法,上面找不到的文件mkmf是ruby1.9.1-dev包的一部分,所以把它安装上就好。
sudo apt-get install ruby1.9.1-dev
接下来立即重试安装compass,成功。

参考

启发:stackoverflow上的解决办法


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