HOWTO build a statically linked tmux in one script (downloads and builds dependencies from source)

build-tmux.sh

#!/bin/bash

if [ -z "${TARGETDIR}" ]; then
    TARGETDIR=$(realpath $PWD)
fi
NCORES=${1:-"1"}

echo "TARGETDIR=${TARGETDIR}"
echo "NCORES=${NCORES}"

mkdir -p $TARGETDIR

libevent() {
  curl -LO https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz
  tar -zxvf libevent-2.1.8-stable.tar.gz
  cd libevent-2.1.8-stable
  ./configure --prefix=$TARGETDIR && make -j${NCORES} && make install
  cd ..
}

ncurses() {
  curl -LO https://ftp.gnu.org/pub/gnu/ncurses/ncurses-6.1.tar.gz
  tar zxvf ncurses-6.1.tar.gz
  cd ncurses-6.1

  ./configure --prefix $TARGETDIR \
              --with-default-terminfo-dir=/usr/share/terminfo \
              --with-terminfo-dirs="/etc/terminfo:/lib/terminfo:/usr/share/terminfo" \
              --enable-pc-files \
              --with-pkg-config-libdir=$HOME/local/lib/pkgconfig \
              --with-shared \
  && make -j${NCORES} && make install
  cd ..
}

tmux() {
  curl -LO https://github.com/tmux/tmux/releases/download/2.7/tmux-2.7.tar.gz
  tar zxvf tmux-2.7.tar.gz
  cd tmux-2.7
  PKG_CONFIG_PATH=$TARGETDIR/lib/pkgconfig \
    ./configure --enable-static --prefix=$TARGETDIR \
    LIBEVENT_CFLAGS="-I${TARGETDIR}/include" \
    LIBEVENT_LIBS="-L${TARGETDIR}/lib -levent" \
    LIBNCURSES_CFLAGS="-I${TARGETDIR}/include/ncurses" \
    LIBNCURSES_LIBS="-L${TARGETDIR}/lib -lncurses" \
      && make -j${NCORES} && make install
  cd ..
  cp $TARGETDIR/bin/tmux .
}

prompt_confirm() {
    COMMAND="${1}"
    NAME="${2}"
    echo "======================================"
    echo "Downloading and building ${NAME}."
    echo "======================================"
    read -p "Are you sure? " REPLY
    echo ""
    if [[ $REPLY =~ ^[Yy]$  ]]
    then
        eval ${COMMAND}
    fi
}

prompt_confirm libevent "LIBEVENT"
prompt_confirm ncurses "NCURSES"
prompt_confirm tmux "TMUX"