Im making an aplication for image filtering and Im sucesfully using the CImg.h library to help with the task, but as you might know the fft isn't for any image and I need to activate the use of the fftw3 library to overcome this. And I dont have any clues on how to do that (I'm super new with Qt), if it helps somehow to the explanation I was able to do that on ZinjaI but for this new aplication I had to move to Qt to get a more friendly GUI. Im using Qt 5.0.2 (32 bits) / Qt creator 2.7.0 on windows with minGW. Thanks a lot for taking the time to read it and any help would be greatly appreciated. Extra: Not as important as the other but if I also can learn how to avoid having the cmd.exe windows poping in front of my GUI would be cool :) (I guess the CImg.h functions make it pop, but not sure)