1. Install VIM74:

• Remove the installed old version:

  $ sudo apt-get remove vim vim-runtime gvim
  

• Download VIM74:

  $ hg clone https://code.google.com/p/vim/
  

• Install prerequisite libraries:

  $ apt-get install ncurses-dev build-essential mercurial python-dev
  

• Build Vim from sources:

  $ cd ~/vim/src
  $ make distclean
  $ # No slash behind "config" 
  $ ./configure --with-python-config-dir=/usr/lib/python2.7/config --enable-pythoninterp -disable-gui --without-x
  $ make
  $ sudo make install
  

2. Edit .vimrc:

• The .vimrc is stored by. Just put it in $HOME

3. Install Vundle(Plugin Manager):

• Set up Vundle:

  $ git clone https://github.com/gmarik/Vundle.vim.git ~/.vim/bundle/Vundle.vim
  

4. Install plugins:

    $ vim ~/.vimrc
   

• In VIM:

  :PluginInstall
  

5. Install YCM:

• Install development tools and CMake:

  $ sudo apt-get install build-essential cmake python-dev
  

• Compiling YCM: Refer to YCM Official Manual

6. Customise:

• Install CSApprox: (which make gvim-only colorschemes work in terminal vim)

  • Download:

    https://www.vim.org/scripts/script.php?script_id=2390

  • unzip it in ~/.vim

  • Edit ~/.vimrc

    set t_Co=256

  • Now you could see background in terminal vim.

• Install terminal fonts(this font is compatible with vim-airline):

  • Download fonts-master:

    https://github.com/Lokaltog/powerline-fonts

  • Run ./install.sh in this package

  • Edit ~/.vimrc(Integrate with powerline font)

    let g:airline_powerline_fonts = 1

  • Change terminal font to "Powerline" Fonts.

• Install vim
• Install vundle
• Install plugins via vundle
• Install powerline, powerline-vim, powerline-font via pacman

There is a cool config repo here, which supports nested tmux sessions. This is really helpful...