function setPath () {
    if (( $# == 0 )); then
        echo "Usage: $0 VAR [PATH, ...]" >&2
        return 1
    fi

    local -r var="$1"
    local paths=("${@:2}")

    case ${#paths[@]} in
        0)
            unset $var;;
        1)
            export $var="$paths";;
        *)
            export $var="${paths[0]}"
            local path
            for path in "${paths[@]:1}"; do
                local val=$(eval echo \$$var)
                export $var="$val:$path"
            done
    esac

    case "$var" in
        "PATH")
            # THINKME: Special case for PATH: we prepend "$prefix/bin"
            # to it.
            PATH="$prefix/bin:$PATH";;
        "PKG_CONFIG_PATH")
            # THINKME: Special case for PKG_CONFIG_PATH: we prepend
            # "$prefix/lib/pkgconfig" to it.
            PKG_CONFIG_PATH="$prefix/lib/pkgconfig:$PKG_CONFIG_PATH";;
        *)
            ;;
    esac
}