Fix CMake conditional include of the FFT module
Fixes #191 (closed)
The FFT module is now only included in the build when all optional dependencies (fftw3, and also pfft and fftw3_mpi when building with MPI support) have been found.
Fixes #191 (closed)
The FFT module is now only included in the build when all optional dependencies (fftw3, and also pfft and fftw3_mpi when building with MPI support) have been found.