在CentOS上升级Ruby

在CentOS中安装Jekyll时，报如下错误

[root@localhost rubygems-2.6.1]# gem install jekyll
Building native extensions.  This could take a while...
ERROR:  Error installing jekyll:
	ERROR: Failed to build gem native extension.

	    current directory: /usr/lib/ruby/gems/1.8/gems/ffi-1.9.10/ext/ffi_c
		/usr/bin/ruby -r ./siteconf20160311-29821-oqnlp6-0.rb extconf.rb
		mkmf.rb can't find header files for ruby at /usr/lib/ruby/ruby.h

		extconf failed, exit code 1

		Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/ffi-1.9.10 for inspection.
		Results logged to /usr/lib/ruby/gems/1.8/extensions/x86-linux/1.8/ffi-1.9.10/gem_make.out

这是由于CentOS中使用YUM安装到Ruby版本太低到原因，CentOS中默认到Ruby版本为1.8.7：

[root@localhost rubygems-2.6.1]# ruby -v
ruby 1.8.7 (2013-06-27 patchlevel 374) [i386-linux]

一些Ruby应用需要Ruby 1.9。这时候需要升级Ruby。

如果已经使用yum安装了ruby和ruby-devel，那么在升级之前需要卸载旧版本：

sudo yum remove ruby ruby-devel

按照如下到方式编译安装Ruby：

$ sudo yum groupinstall "Development Tools"
$ sudo yum install openssl-devel
$ wget http://cache.ruby-lang.org/pub/ruby/2.1/ruby-2.1.2.tar.gz
$ tar xvfvz ruby-2.1.2.tar.gz
$ cd ruby-2.1.2
$ ./configure
$ make
$ sudo make install

如果启动Jekyll时报如下错误：

Yikes! It looks like you don't have pygments or one of its dependencies installed. In order to use Jekyll as currently configured, you'll need to install this gem.

则需要安装pygmenys：

gem install pygments.rb

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