install tmux from git in ubuntu (tested in 15.04)

tmux_from_git.sh

#!/bin/sh
tdir=`mktemp -d`                                                                                       
cd $tdir         
sudo apt-get install -y --force-yes libevent-dev libncurses-dev pkg-config autoconf
git clone https://github.com/tmux/tmux
cd tmux
autoreconf -fis
./configure
make
sudo make install