Ignoring ffi-1.13.1 because its extensions are not built. Try: gem pristine ffi --version 1.13.1

Question

Basically, you need to do what the warning message says: install the Gem "ffi" in the specified version by running gem pristine ffi --version 1.13.1. However, usually you don't have write permissions on the system to install a Gem into the stated directory.

You could probably just use sudo, i.e. run the command sudo gem pristine ffi --version 1.13.1 and enter the password, but I guess this is generally not recommended as it is a security risk.

I installed it like this:

gem install ffi --version 1.13.1 --user-install

Then I had to add the installation path to my PATH variable; in my case I added this line to my ~/.zshrc:

export PATH=$HOME/.gem/ruby/2.6.0/bin:$PATH

I'm really not an expert on Ruby stuff, but this solved the issue for me.

This solved the issue for me

brew install cocoapods

should already be linked (as pointed out by Raphael Pinel) but if you want to make sure run

brew link --overwrite cocoapods

On Monterey. I did this:

pod install --repo-update
.....Ignoring ffi-1.15.3 because its extensions are not built. Try: gem pristine ffi --version 1.15.3

% brew install cocoapods
% brew link --overwrite cocoapods
% brew outdated
% brew upgrade

But, same problem.

% pod install --repo-update
result... Ignoring ffi-1.15.3 because its extensions are not built. Try: gem pristine ffi --version 1.15.3

I don't have permission to install it in that directory.