Qt安装 Qt platform plugin "xcb".

This application failed to start because it could not find or load the Qt platform plugin "xcb".

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

Reinstalling the application may fix this problem.

把你的qt的库文件目录添加到PATH等环境变量中

http://stackoverflow.com/questions/17106315/failed-to-load-platform-plugin-xcb-while-launching-qt5-app-on-linux-without

使用 ldd (man ldd)看下包依赖关系，执行以下脚本
.../platforms$ ldd libqxcb.so

具体参考
http://stackoverflow.com/questions/17106315/failed-to-load-platform-plugin-xcb-while-launching-qt5-app-on-linux-without
http://askubuntu.com/questions/308128/failed-to-load-platform-plugin-xcb-while-launching-qt5-app-on-linux-without

我也遇到了这个提示，后来看厂家给的手册提示：执行 qt5.5 官方例程镜像时，命令后面要加上 -platform
eglfs，如: ./pinchzoom -platform eglfs，这样就ok了，可以把后面这个platform加到环境变量