I'm sorry to post what is probably the 1000th post about the subject but I did follow the instructions and I'm still stuck.

I've installed Qwt 6.1.0 (qmake, nmake, nmake install). I've also set permanently the QMAKEFEATURES to the features dir and it correctly shows the features folder path if I do "-query" on that variable.

However even with "CONFIG += qwt", the line
Qt Code: 
  1. include "qwt_plot.h"
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gives me the error of "cannot open include file".

I've done it now in the command prompt of Qt 5.1. (qmake, nmake).

Could anyone please help me find the problem?