Thx Andy for all these details.
Had a clean Macports Installed after having previously removed it, months ago, from my system, uninstalled the Macports official way.
Will give it another try with these new instruction about gnu. Later ...
For now, I'm worn out editing videos one after the other.
I feel no pleasure having to go through all this. Not enough geekblood in my veins I guess.
It's not my main hobby to use procedures that remind me of my horrible Windows years.
One related question : Once GQRX is build on one computer, what needs to be done to get a "portable" version, where all the dependencies are in a bundle with the app ?
Want to be able to transfer the goods to another Mac, without having to spend another hour installing Macports and it's huge amount of dependencies followed by 40 min session to get GQRX in a usable state ?
What does it take to get a real .dmg installer, compatible with at least Mojave ?
Has the official dmg file been limited to having at least Catalina because of the same OS version of the host computer creating the dmg ?
BTW :
Had SdrGlut for some weeks and it's even worse to handle than Cubic.
Minimalistic layout, an X11 generated gui ( hello Windblows 98 !!! ) and terminal open ...
Sorry, not my taste. But thanks righthalfplane for the tip. Always good to know.
Thank you guys for your help and advice.
alex