> I believe they are not at all compatible. But version 2 is still > maintained, the package is called fftw2 (and fftw2-devel) Thanks. On rpmforge, fftw ver. 3.* is called fftw3. It is really pretty bad practice to distribute version 3 as a simple upgrade to fftw ver. 2.* when the two versions are not compatible, and the API has changed... Cheers, Morten