Hi, I tried what you replied with with no luck. That dependency is already installed.
% brew install homebrew/portable-ruby/portable-readline
fatal: Could not resolve HEAD to a revision
Warning: homebrew/portable-ruby/portable-readline 8.1.1 is already installed and up-to-date.
To reinstall 8.1.1, run:
brew reinstall portable-readline
% brew install --with-generic proxmark3
Warning: No available formula with the name "readline" (dependency of rfidresearchgroup/proxmark3/proxmark3).
==> Searching for similarly named formulae...
This similarly named formula was found:
homebrew/portable-ruby/portable-readline ✔
To install it, run:
brew install homebrew/portable-ruby/portable-readline ✔
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching taps on GitHub...
Error: No formulae found in taps.