bash script for installing tmux without root access

tmux_local_install.sh

#!/bin/bash

# Script for installing tmux on systems where you don't have root access or you want a different version.
# tmux will be installed in $HOME/local/bin.
# It's assumed that wget and a C/C++ compiler are installed.
# To install in a box with no external connection donwload the source files and put them in the temp_dir.
# TODO:
# manage local source files better

# exit on error
set -e

temp_dir=$HOME/tmux_tmp

TMUX_VERSION=2.3
LIBEVENT_VERSION=2.1.8
NCURSES_VERSION=6.0

function remove_temp_dir {
  echo "removing building dir"
  rm -rf ${temp_dir}
}
trap remove_temp_dir EXIT

# create our directories
mkdir -p $HOME/local ${temp_dir}
cd ${temp_dir}

# if we don't have local source files in the temp_dir, download them
if [ ! -f tmux-${TMUX_VERSION}.tar.gz ]
  then
    wget https://github.com/tmux/tmux/releases/download/${TMUX_VERSION}/tmux-${TMUX_VERSION}.tar.gz
fi
if [ ! -f libevent-${LIBEVENT_VERSION}-stable.tar.gz ]
  then
    wget https://github.com/libevent/libevent/releases/download/release-${LIBEVENT_VERSION}-stable/libevent-${LIBEVENT_VERSION}-stable.tar.gz
fi
if [ ! -f ncurses-${NCURSES_VERSION}.tar.gz ]
  then
    wget https://ftp.gnu.org/pub/gnu/ncurses/ncurses-${NCURSES_VERSION}.tar.gz
fi

# extract files, configure, and compile

############
# libevent #
############
tar xvzf libevent-${LIBEVENT_VERSION}-stable.tar.gz
cd libevent-${LIBEVENT_VERSION}-stable
./configure --prefix=$HOME/local --disable-shared
make
make install
cd ..

############
# ncurses  #
############
tar xvzf ncurses-${NCURSES_VERSION}.tar.gz
cd ncurses-${NCURSES_VERSION}
# the CPPFLAGS is necessary because of a bug in mawk
CPPFLAGS=-P ./configure --prefix=$HOME/local
make
make install
cd ..

############
# tmux     #
############
tar xvzf tmux-${TMUX_VERSION}.tar.gz
cd tmux-${TMUX_VERSION}
./configure CFLAGS="-I$HOME/local/include -I$HOME/local/include/ncurses" LDFLAGS="-L$HOME/local/lib -L$HOME/local/include/ncurses -L$HOME/local/include"
CPPFLAGS="-I$HOME/local/include -I$HOME/local/include/ncurses" LDFLAGS="-static -L$HOME/local/include -L$HOME/local/include/ncurses -L$HOME/local/lib" make
cp tmux $HOME/local/bin
cd ..

echo "$HOME/local/bin/tmux is now available. You can optionally add $HOME/local/bin to your PATH."