app.pro Example File

 include(../spectrum.pri)

 static: error(This application cannot be statically linked to the fftreal library)

 TEMPLATE = app

 TARGET = spectrum

 QT       += multimedia

 SOURCES  += main.cpp \
             engine.cpp \
             frequencyspectrum.cpp \
             levelmeter.cpp \
             mainwidget.cpp \
             progressbar.cpp \
             settingsdialog.cpp \
             spectrograph.cpp \
             spectrumanalyser.cpp \
             tonegenerator.cpp \
             tonegeneratordialog.cpp \
             utils.cpp \
             waveform.cpp \
             wavfile.cpp

 HEADERS  += engine.h \
             frequencyspectrum.h \
             levelmeter.h \
             mainwidget.h \
             progressbar.h \
             settingsdialog.h \
             spectrograph.h \
             spectrum.h \
             spectrumanalyser.h \
             tonegenerator.h \
             tonegeneratordialog.h \
             utils.h \
             waveform.h \
             wavfile.h

 fftreal_dir = ../3rdparty/fftreal

 INCLUDEPATH += $${fftreal_dir}

 RESOURCES = spectrum.qrc

 # Dynamic linkage against FFTReal DLL
 !contains(DEFINES, DISABLE_FFT) {
     macx {
         # Link to fftreal framework
         LIBS += -F$${fftreal_dir}
         LIBS += -framework fftreal
     } else {
         LIBS += -L..$${spectrum_build_dir}
         LIBS += -lfftreal
     }
 }

 # Install

 sources.files = $$SOURCES $$HEADERS $$RESOURCES app.pro
 sources.path = $$[QT_INSTALL_EXAMPLES]/qtmultimedia/spectrum/app
 images.files += images/record.png images/settings.png
 images.path = $$[QT_INSTALL_EXAMPLES]/qtmultimedia/spectrum/app/images
 INSTALLS += sources images

 # Deployment

 DESTDIR = ..$${spectrum_build_dir}
 macx {
     !contains(DEFINES, DISABLE_FFT) {
         # Relocate fftreal.framework into spectrum.app bundle
         framework_dir = ../spectrum.app/Contents/Frameworks
         framework_name = fftreal.framework/Versions/1/fftreal
         QMAKE_POST_LINK = \
             mkdir -p $${framework_dir} &&\
             rm -rf $${framework_dir}/fftreal.framework &&\
             cp -R $${fftreal_dir}/fftreal.framework $${framework_dir} &&\
             install_name_tool -id @executable_path/../Frameworks/$${framework_name} \
                                 $${framework_dir}/$${framework_name} &&\
             install_name_tool -change $${framework_name} \
                                 @executable_path/../Frameworks/$${framework_name} \
                                 ../spectrum.app/Contents/MacOS/spectrum
     }
 } else {
     linux-g++*: {
         # Provide relative path from application to fftreal library
         QMAKE_LFLAGS += -Wl,--rpath=\\\$\$ORIGIN
     }
 }

 QT+=widgets