Compile latest emacs version in Ubuntu Precise, Trusty ...

build-emacs.sh

#!/bin/bash

# Build latest version of Emacs, version management with stow
# OS: Tested on Ubuntu 12.04 LTS onward 
# version: 25.1
# Toolkit: lucid

set -e

readonly version="26.2"

# install dependencies
sudo apt-get install -y stow
sudo apt-get build-dep emacs25 
# Change to emacs23, emacs25 or any version available on your current Ubuntu. 

# download source package
if [[ ! -d emacs-"$version" ]]; then
   wget http://ftp.gnu.org/gnu/emacs/emacs-"$version".tar.xz
   tar xvf emacs-"$version".tar.xz
fi

# buil and install
cd emacs-"$version"
./configure \
    --with-xft \
    --with-x-toolkit=lucid
make -j4
sudo make install prefix=/usr/local/stow/emacs-"$version"
cd /usr/local/stow
sudo stow emacs-"$version"