cmake HAVE_FFTW3 examples

spotify/pedalboard CMakeLists.txt :183 

add_compile_definitions(
        HAVE_FFTW3=1
        LACK_SINCOS=1 
        FFTW_DOUBLE_ONLY=1
        USE_PTHREADS
    )

casacore/casacore CMakeLists.txt :414 

add_definitions(-DHAVE_FFTW3)