qt5.7 安装

http://blog.csdn.net/liang19890820/article/details/53931813#安装-qt57

安装运行出错：qt vstool 指定qt安装路径

http://blog.csdn.net/hk_5788/article/details/44902933

qt:

http://download.qt.io/archive/qt/5.7/5.7.1/