Parkeepr和Doctrine安装

Question

I am trying to install Partkeepr in Linux Mint, but I am stucked at the point in which doctrine should be installed. A problem I find is that the channel to install it with pear is not there anymor.

The error I'm getting from Partkeepr is:

Doctrine needs to be installed and in the PHP include_path. You can install doctrine on most unix systems using:

pear channel-discover pear.symfony.com
pear channel-discover pear.doctrine-project.org
pear install pear.doctrine-project.org/DoctrineORM
Doctrine\Common\ClassLoader was not found

I also tried install Doctrine with composer, by adding the following to the composer.json file:

{
    "require": {
        "doctrine/orm": "*"
    }
}

But this does not help at all. ¿Any suggestions on how to solve this?