compile_qt() {
    local ver="$1"; shift
    
    $(compile_qt_get_cmd qmake "$ver") PREFIX="/$dir_prefix" build_mode=release build_type=shared $@
    make
    make INSTALL_ROOT="$dir_install" install
}

compile_qt_get_cmd() {
    local cmd="$1"; shift
    local ver="$1"

    # Some machines don't have cmd-qt4, and use cmd instead.
    if [ "$ver" = "4" ]; then
        if command -v "$cmd-qt$ver" > /dev/null; then
            echo "$cmd-qt$ver"
        else
            echo "$cmd"
        fi
    else
        echo "$cmd-qt$ver"
    fi
}