X11 fluxbox窗口管理器

/*********************************************************************************
 *                              X11 fluxbox窗口管理器
 * 说明：
 *     之前一直想知道怎么整一个有桌面系统的系统，看一下fluxbox窗口管理器，Qt5已经默认没有窗口管理器。
 *
 *                                              2017-11-28 深圳 南山平山村 曾剑锋
 ********************************************************************************/

一、参考文档：
    . Building a tiny X.Org Linux System using Buildroot
        https://agentoss.wordpress.com/2011/03/06/building-a-tiny-x-org-linux-system-using-buildroot/
    . Fluxbox don't start
        http://daemonforums.org/showthread.php?t=3684

二、错误解决：
. 采用fluxbox窗口管理器：
    . error
        # exec fluxbox
        Error: Couldn't connect to XServer passing null display
    . resolution
        # cat ~/.xinitrc
        #setxkbmap fr
        xterm &
        exec startfluxbox

三、startx执行输出信息：
    # startx &
    # expr: warning: '^/dev/tty[0-9]\+$': using '^' as the first character
    of a basic regular expression is not portable; it is ignored
    xauth:  file /root/.serverauth. does not exist

    X.Org X Server 1.19.
    Release Date: --
    X Protocol Version , Revision
    Build Operating System: Linux 4.8.--generic x86_64
    Current Operating System: Linux AplexOS 3.0.-gee39e37-dirty # SMP PREEMPT Mon Oct  :: CST  armv7l
    Kernel command line: console=ttymxc0, ip=none root=/dev/mmcblk0p1 rootwait
    Build Date:  November   ::55PM

    Current version of pixman: 0.34.
            Before reporting problems, check http://wiki.x.org
            to make sure that you have the latest version.
    Markers: (--) probed, (**) from config file, (==) default setting,
            (++) from command line, (!!) notice, (II) informational,
            (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
    (==) Log file: "/var/log/Xorg.0.log", Time: Tue Nov  ::
    (==) Using default built-in configuration ( lines)
    Failed to read: session.ignoreBorder
    Setting default value
    Failed to read: session.forcePseudoTransparency
    Setting default value
    Failed to read: session.colorsPerChannel
    Setting default value
    Failed to read: session.doubleClickInterval
    Setting default value
    ......
    Setting default value
    Failed to read: session.screen0.iconbar.usePixmap
    Setting default value
    Failed to read: session.screen0.strftimeFormat
    Setting default value