Flair installation on macOS Catalina error

[Ephemera]

Dear Luigi,
Thank you very much!

@luillo

Please check if the ~/.bash_profile contains the following line
export PATH="/opt/local/bin:/opt/local/sbin:$PATH"
which MacPorts should have added.

This was the problem, MacPorts did not add export PATH=/opt/local/bin:/opt/local/sbin:$PATH to my profile (in my case is ~/.zshrc.
Thank you so much for your help!!
Z.