Problems with readline

[Jack Fearnley <jack@alcor.concordia.ca>]

I have decided to download the latest stable version of Pari into my 
Ubuntu 16.04 partition. It seems I have a few alternative ways of doing 
this. And none of them, so far, successfully incorporate readline.

1)  Use the synaptic package manager to acquire readline and then 
acquire Pari

1a) Uninstall the above before moving to 2).

2) Download readline from the Pari site and do ./configure etc.
Then download Pari from the Pari site and do ./configure etc

3) Download readline from the Pari site and do ./configure etc.
Then download Pari and compile it. I haven't tried this yet.

Am I missing something obvious?

Why doesn't the Pari package simply incorporate Readline? I cannot 
imagine anyone NOT wanting it!

Up to now I have been using the Pari that comes with Sagemath and 
readline seems to be automatic with that package.

Best regards,
                      Jack Fearnley