Updated ruby (markdown)

ruby.md

@@ -29,7 +29,19 @@ sudo pacman -S gvim
 
 You can build the recent version of Vim from source.
 
-- [Installing Vim on CentOS 6.3](http://sudoers-d.com/blog/2013/01/18/installing-vim-on-centos-6-dot-3/)
+```sh
+# Install prerequisites
+sudo yum install -y ruby ruby-devel ncurses-devel
+
+# Clone Vim repository
+hg clone https://code.google.com/p/vim/
+
+# Compile with Ruby interpreter and install
+cd vim
+./configure --with-features=huge --enable-rubyinterp
+make -j $(nprocs)
+sudo make install
+```
 
 ### Windows