Script that will update system pkgconf to the desire version as alternatives

update-pkgconf.sh

#!/bin/bash
set -e

WHAT=pkgconf
VERSION=2.2.0
FULLNAME=${WHAT}-${VERSION}
INSTDIR=/opt/${FULLNAME}

function install() {
    [ $# -eq 0 ] && { run_error "Usage: install <version>"; exit; }
    local VERSION=${1}
    local TARBALL=${FULLNAME}.tar.gz
    local URL=https://github.com/pkgconf/pkgconf/archive/refs/tags/${TARBALL}
    local WHERE=/tmp/update-${WHAT}
    local ARCH=$(gcc -dumpmachine)
    mkdir -p ${WHERE}
    cd ${WHERE}
    echo "Downloading ${URL}"
    curl -L --create-dirs -o ${TARBALL} ${URL}

    if [ -f "${TARBALL}" ]; then
        tar -xzf ${TARBALL}
        cd pkgconf-${FULLNAME}
        libtoolize
        ./autogen.sh
        ./configure --prefix=${INSTDIR} --with-pkg-config-dir=/usr/local/lib/pkgconfig:/usr/share/pkgconfig:/usr/lib/${ARCH}/pkgconfig
        make
        echo "Installing..."
        sudo make install
        # Making a local install alias pkg-config
        sudo ln -sf ${INSTDIR}/bin/pkgconf ${INSTDIR}/bin/pkg-config
        echo -e "${TARBALL} installed \e[1;32mOK\e[39m"
    else
        echo -e "Cannot download ${URL}"
        exit 1
    fi
}

function install_alternatives() {
    for fullpath in ${INSTDIR}/bin/* ; do
        local NAME="$(basename ${fullpath})"
        #echo "sudo update-alternatives --install /usr/local/bin/${NAME} ${NAME} ${fullpath} 50"
        sudo update-alternatives --install /usr/local/bin/${NAME} ${NAME} ${fullpath} 50
    done

    # Note: without the pkg.m4 macros, you will see PKG_CHECK_MODULES
    # errors during configure phase, so let's provide it to aclocal
    local ACDIR=$(aclocal --print-ac-dir)
    if [ ! -z "${ACDIR}" ]; then
        sudo ln ${INSTDIR}/share/aclocal/pkg.m4 ${ACDIR}/pkg.m4
    else
        echo "Warning: Cannot provide pkg.m4"
    fi

    # Note: if pkgconf/pkg-config fail to run, you will see PKG_CHECK_MODULES
    # errors during configure phase. So add shared libraries to the ld cache.
    sudo ldconfig ${INSTDIR}/lib
    . ~/.profile
}

function remove_alternatives() {
    for fullpath in ${INSTDIR}/bin/* ; do
        local NAME="$(basename ${fullpath})"
        #echo "sudo update-alternatives --remove ${NAME} ${fullpath}"
        sudo update-alternatives --remove ${NAME} ${fullpath}
    done

    local ACDIR=$(aclocal --print-ac-dir)
    if [ ! -z "${ACDIR}" ]; then
        sudo rm ${ACDIR}/pkg.m4
    fi

    . ~/.profile
}

if declare -f "$1" > /dev/null
then
    "$@"
else
    install ${VERSION}
    install_alternatives
fi