I’m modifying a config file template. I’m trying to build 9.6.2 in ubuntu 18.04. I have fftw3 installed from the ubuntu repositrory. The key with_fftw3 apparently points to where the libraries are installed. Mine are under /usr/lib/x86_64-linux-gnux86_64-linux-gnu. Exactly what does the install prefix point to? does it point to the actual directory, or does it point to the directory under which the lib directory sits?
Thanks,
Art Edwards