Qt在VS2012中引用QtWidgets时报GLES2/gl2.h无法打开错误的解决办
在VS2012中编译QT时，要使用控件就得引用QtWidgets。如下 #include QtWidgets 引入这个之后，VS会解出相关的文件，这时就可以正常使用相关的控件如QLabel/QLineEdit等，当然也可以通过#include QtWidgets/QLabel这样单一引用，不过每一类控件都需要引用一次
在VS2012中编译QT时，要使用控件就得引用QtWidgets。如下
#include <qtwidgets></qtwidgets>
引入这个之后，VS会解出相关的文件，这时就可以正常使用相关的控件如QLabel/QLineEdit等，当然也可以通过#include
代码正常编写的。但是编译时却出错了，如下图
错误指向的是GLES2/gl2.h，这个是QT自带的，所以在QT安装路径下一搜，发现果真有的。并且是在include/QtANGLE的文件夹下。看来是配置中没有带上。于是进行了配置，如下图。
在附加包含目录中添上$(QTDIR)\include\QtANGLE，其中$(QTDIR)是一个全局变量，指的是QT的目录。
再次编译，通过了。
作下记录，以备后用。
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