Hi, and thanks for your help, I would like to know if someone has already installed a FFTW library to perform Fourier transforms. If so, could you explain me how to do it? Thank you Javier -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/