Farid:
Is is off-line.
We stopped using it, and it's not included in our Zynq designs anymore. We found the software only version of FFTW to be faster on the ARM A9. (adding the FFT, caused timing constraints on the ZC7020, since the fabric was filling up).
It may still be in some of the fabric only solutions - but it hasn't received much TLC.
-Robin