declare prefix
function setPrefix () {
    if (( $# != 1 )); then
        echo "Usage: $0 PREFIX" >&2
        return 1
    fi
    prefix="$1"
}

declare -a configArgs
function setConfigArgs () {
    configArgs=( \
        PATH="$PATH" \
        PKG_CONFIG_PATH="$PKG_CONFIG_PATH" \
        "$@" \
        )
}

declare buildTarget
function setBuildTarget () {
    if (( $# != 1 )); then
        echo "Usage: $0 TARGET" >&2
        return 1
    fi
    buildTarget="$1"
}

declare docDirectory
function setDocDirectory () {
    if (( $# != 1 )); then
        echo "Usage: $0 DIRECTORY" >&2
        return 1
    fi
    docDirectory="$1"
}

declare docTarget
function setDocTarget () {
    if (( $# != 1 )); then
        echo "Usage: $0 TARGET" >&2
        return 1
    fi
    docTarget="$1"
}