Re-define the package inline in your composer.json

gistfile1.json

{
    "repositories": {
        "doctrine-fixtures-bundle": {
            "name": "doctrine/doctrine-fixtures-bundle",
            "type": "symfony-bundle",
            "version": "2.0.0",
            "require": {
                "php": ">=5.3.2",
                "symfony/symfony": ">=2.0"
            },
            "autoload": {
                "psr-0": { "Doctrine\\Bundle\\FixturesBundle": "" }
            },
            "target-dir": "Doctrine/Bundle/FixturesBundle",
            "source": {
                "url": "https://github.com/doctrine/DoctrineFixturesBundle.git",
                "type": "git",
                "reference": "2.0"
            }
        }
    }
    "require": {
        "doctrine/doctrine-fixtures-bundle"
    }
}