My system is Windows 7, 64bit. I have got a problem by running fftw 3.3.4 under QT 5.3.1.

1. I have downloaded the fftw-3.3.4-dll64.zip, and unzipped them into my project folders:
D:\QT\Test\FFT\build-FFTtest-Desktop_Qt_5_3_MinGW_32bit-Debug\release and ..\debug

2. I have added the lines into my project:
QT += core

QT -= gui

TARGET = FFTtest
CONFIG += console
CONFIG -= app_bundle

LIBS += "D:\QT\Test\FFT\build-FFTtest-Desktop_Qt_5_3_MinGW_32bit-Debug\release\libfftw3-3.dll"
LIBS += "D:\QT\Test\FFT\build-FFTtest-Desktop_Qt_5_3_MinGW_32bit-Debug\release\libfftw3f-3.dll"
LIBS += "D:\QT\Test\FFT\build-FFTtest-Desktop_Qt_5_3_MinGW_32bit-Debug\release\libfftw3l-3.dll"

!exists( libfftw3-3.dll ) {
error( "No libfftw3-3.dll file found" )
}
TEMPLATE = app


SOURCES += main.cpp

HEADERS += \
fftw3.h

[url]http://qt-project.org/wiki/How-to-compute-FFT-using-FFTW-in-Qt[/url]
3. the "fftw3.h" has been included into my project.
After compiling it shows two errors: "file not recognized: file format not recognized" and "error: ID returned 1. exit status"
Here is what from the compiler:
Makefile.Debug:77: recipe for target 'debug\FFTtest.exe' failed
mingw32-make[1]: *** [debug\FFTtest.exe] Error 1
mingw32-make[1]: Leaving directory 'D:/QT/Test/FFT/build-FFTtest-Desktop_Qt_5_3_MinGW_32bit-Debug'
Makefile:34: recipe for target 'debug' failed
mingw32-make: *** [debug] Error 2
12:11:26: Der Prozess "C:\Qt\Qt5.3.1\Tools\mingw482_32\bin\mingw32-make.exe" wurde mit dem Rückgabewert 2 beendet.
Fehler beim Erstellen/Deployment des Projekts FFTtest (Kit: Desktop Qt 5.3 MinGW 32bit)
Bei der Ausführung von Schritt 'Make'
12:11:26: Verstrichene Zeit: 00:01.
Do you have an idea?