Easy way to Install libsass & sassc in Ubuntu, `curl -sSL http://git.io/vnxQ4 | sudo bash`

install_libsass.sh

#!/bin/bash

# Based on https://gist.github.com/edouard-lopez/503d40a5c1a49cf8ae87

set -e

# Installing dependencies
apt-get -q -y install build-essential automake libtool git

buildDir="/tmp/sass-build"
version="3.2.5"
prefix="/usr/local"
sources=(libsass sassc)

export SASS_LIBSASS_PATH="$buildDir/libsass"

if [ -d "$buildDir" ]; then
	rm -rf "$buildDir";
fi

# Create build dir inside /tmp
echo "Creating build directory ($buildDir)"
mkdir "$buildDir"
cd $buildDir

for src in "${sources[@]}"; do
	echo "[$src] Cloning repository"
	git clone -q https://github.com/sass/$src --branch $version --depth 1 > /dev/null 2>&1 && cd $src

	echo "[$src] Creating configuration"
	autoreconf --force --install > /dev/null 2>&1

	echo "[$src] Configuring compiler"
	./configure --enable-shared --prefix=$prefix > /dev/null 2>&1

	echo "[$src] Compiling installer"
	make > /dev/null 2>&1

	echo "[$src] Installing "
	make install > /dev/null 2>&1

	echo "[$src] Done"
	cd ..
done

rm -rf "$buildDir"
echo "Everything is done"

Pass the version required as a parameter.
Possibly use /usr/local/share for the source - it can speed up subsequent builds.