Ah, ok. I had already installed php5-cli on my system before trying interactive mode, so I didn't see that error. Mint 10 is Ubuntu based, correct? I don't have this problem on my Ubuntu distributions, but I'm not using Linux Mint's Ubuntu derivatives, just the Debian one. Hopefully something will come out of that bugreport that won't involve having to compile php5 from source. I've had the problem about not being linked to libreadline on hosting platforms before, but never from a package standard to a repository.