installing PHP pear packages? (and Crypt/Blowfish.php)

["Jeremy C. Reed" <reed%reedmedia.net@localhost>]

What is the recommended way to install PHP pear packages?

I need Crypt/Blowfish.php

The copy I see from another install (not pkgsrc) has

http://pear.php.net/package/Crypt_Blowfish

So what is the pkgsrc way to install this?

Do I use some pear tool to install it? If so will it clutter my LOCALBASE? 
Or will it be registered as a pkgsrc package?

(I have not installed lang/pear yet.)

Do I package it for pkgsrc? If so, what is an example template to look at?

Thanks