Qt Creator Qt creator Adding external library (still: Cannot open include file: 'GL/glew.h')

I followed the instruction:

In the Projects pane, open the project file (.pro).
Right-click in the code editor to open the context menu and select Add Library....
Attachment 8687

Then the following lines were added into the pro file:

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/D:/OpenGL/glew-1.5.4/lib/ -lglew32
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/D:/OpenGL/glew-1.5.4/lib/ -lglew32d

INCLUDEPATH += $$PWD/D:/OpenGL/glew-1.5.4/include
DEPENDPATH += $$PWD/D:/OpenGL/glew-1.5.4/include

However, I click the green triangle icon on the bottom left the run the program, still get the errors:

error: C1083: Cannot open include file: 'GL/glew.h': No such file or directory

Why? Thanks in advance