(C++) How to add an #include folder in Qt Creator?

 

Qt Creator FAQ.

 

If you want to add an extra #include folder in your Qt Creator project file, do the following:

1. View your project (ALT-0)
2. Double-click on your project file (HelloWorld.pro for example) to open the code editor
3. Add an INCLUDEPATH line:

 

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INCLUDEPATH += ../../../boost