Hi Massimo,
I have been trying to build from sources and was following this step.
sudo port install libftdi0 pkgconfig libmad libsndfile fftw-3 ola
After a bit of trouble shooting in the error logs I released that libftdi0 should be libftdi1.
OLA is still refusing to install. I have opened a ticket with MacPorts. Hopefully someone can help sort that out.
Also for Mac users with muli-core processors Make -j n (where n is the number of cores) seems to run much quicker
Cheers
Mark
Mac OSX Mojave (10.14.6)
Qt5.13.0
Xcode Version 11.3