Ignoring ffi-1.13.1 because its extensions are not built. Try: gem pristine ffi --version 1.13.1
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 with 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
I'm really not an expert on Ruby stuff, but this solved the issue for me.