ROOT 5.22 and FFTW3

Hi all,
I’ve been using ROOT 5.22 and I tested successfully the class RooFFTConvPdf running the tutorial macro and other examples I wrote.
Now, in the manual it is said that FFTW3 is required to run with ROOT to work with RooFFTConvPdf class but it doesn’t seem so.
Is it still needed to install the FFTW3 package or is it fully included in ROOT 5.22?

Thanks a lot

in the binary tar balls, ROOT has been configured with the fftw3 package.
If you install from source you must configure with fft3 (see install page)