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：
    1. 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/
    2. Fluxbox don't start
        http://daemonforums.org/showthread.php?t=3684

二、错误解决：
1. 采用fluxbox窗口管理器：
    1. error
        # exec fluxbox
        Error: Couldn't connect to XServer passing null display
    2. 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.1508 does not exist
    
    
    X.Org X Server 1.19.1
    Release Date: 2017-01-11
    X Protocol Version 11, Revision 0
    Build Operating System: Linux 4.8.0-59-generic x86_64
    Current Operating System: Linux AplexOS 3.0.35-gee39e37-dirty #23 SMP PREEMPT Mon Oct 16 19:31:35 CST 2017 armv7l
    Kernel command line: console=ttymxc0,115200 ip=none root=/dev/mmcblk0p1 rootwait
    Build Date: 24 November 2017  02:54:55PM
    
    Current version of pixman: 0.34.0
            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 28 02:50:37 2017
    (==) Using default built-in configuration (21 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