Man pages matching name fftw-wisdom-to-conf in section 1:

fftw-wisdom-to-conf.1.en	debian 10 / libfftw3-bin
fftw-wisdom-to-conf.1.en	debian 11 / libfftw3-bin
fftw-wisdom-to-conf.1.en	debian 12 / libfftw3-bin