安装条件

要有git，要有ruby1.9.3版，要有rvm或者rbenv。

不过rvm似乎只是用来安装ruby，所以不清楚如果已经安装配置了ruby1.9.3版，是不是就不用它了呢？

RVM的安装方法参考Octopress的说明是这样的：

在命令行下执行：

list element with functor item

curl -L https://get.rvm.io | bash -s stable --ruby  <!-- more -->

list element with functor item

list element with functor item

安装过程中会自动安装ruby2.1.2：

ruby-2.1.2 - #validate archive
ruby-2.1.2 - #extract
……
$ ruby --version
ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-linux]

所以应该需要：

rvm install 1.9.3
rvm use 1.9.3
rvm rubygems latest

最后会告诉你：

  * To start using RVM you need to run `source /home/pangyi/.rvm/scripts/rvm`
    in all your open shell windows, in rare cases you need to reopen all shell windows.

还要装一下rake，需要使用gem：

sudo gem install rake

Octopress的安装

首先：

git clone git://github.com/imathis/octopress.git octopress
cd octopress

然后安装主题：

sudo gem install bundler
bundle install
rake install

在UBUNTU中需要加sudo。如果rake没装，请看上面。

后记——使用UBUNTU自带版本安装

UBUNTU自带版本为：

$ ruby -v
ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]

为了迁就octoeditor等VIM插件（从gvim启动时，无法用rvm use指定ruby版本），就需要以这个版本来安装了。安装时报了一些错误：

$ bundle install
Fetching gem metadata from https://rubygems.org/.......
Using rake 10.3.2

Gem::Installer::ExtensionBuildError: 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:1:in `<main>‘


Gem files will remain installed in /tmp/bundler20141115-3546-1wbtw8p/RedCloth-4.2.9/gems/RedCloth-4.2.9 for inspection.
Results logged to /tmp/bundler20141115-3546-1wbtw8p/RedCloth-4.2.9/gems/RedCloth-4.2.9/ext/redcloth_scan/gem_make.out
An error occurred while installing RedCloth (4.2.9), and Bundler cannot
continue.
Make sure that `gem install RedCloth -v ‘4.2.9‘` succeeds before bundling.