【linux】failed to start because it could not find or load the Qt platform plugin "xcb"

• 【问题描述】
  在开发板上运行qt程序报错，错误提示如下：

root@M6708-T:~# /untitled 
This application failed to start because it could not find or load the Qt platform plugin "xcb".

Available platform plugins are: eglfs, minimal, minimalegl, offscreen.

Reinstalling the application may fix this problem.

• 【问题定位】
  qt相关环境变量配置不对。
• 【解决方案】
  执行如下命令后再执行，OK.

export QT_QPA_PLATFORM=eglfs