Here are the steps to install the latest version of VIM with Ruby and Python support.

Mac OSX

• Install the latest Xcode from the AppStore.
• Install homebrew.

$ ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"

• Install mercurial using homebrew.

$ brew install mercurial

Red Hat / CentOS

• Install mercurial using yum.

$ yum -y install mercurial

• Install the dependency rpms.

$ yum -y groupinstall 'Development Tools'

$ yum -y install ruby perl-devel python-devel ruby-devel perl-ExtUtils-Embed ncurses-devel

Clone and install VIM

• Clone the vim repository using mercurial.

$ hg clone https://vim.googlecode.com/hg/ ~/vim

• Now compile and install vim.

$ cd ~/vim

$ ./configure --prefix=/usr/local --enable-multibyte  --with-tlib=ncurses --enable-pythoninterp --enable-rubyinterp --with-ruby-command=/usr/bin/ruby --with-features=huge

$ make

$ sudo make install 

• This will install the latest vim to /usr/local/bin.
• Add the new vim version to your ~/.bashrc or ~/.zshrc.

export PATH=/usr/local/bin:$PATH

alias vi='/usr/local/bin/vim'

Ref: http://www.vimninjas.com/2012/09/21/vim-ruby-python