doctrine ORM

$ ./composer.phar require doctrine/orm 2.4.*                                   
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)         
  - Installing doctrine/collections (dev-master 3661cd8)
    Cloning 3661cd8bc5152598dbe6772e98b78d1fa8281a67

  - Installing doctrine/cache (dev-master e7b77e5)
    Cloning e7b77e5abe230a2cc1db5005fb86435da213ae3b

  - Installing doctrine/inflector (dev-master b0b2fef)
    Cloning b0b2feffb47906a03b570777c07044c529d1d124

  - Installing doctrine/common (2.5.x-dev 26727ba)
    Cloning 26727ba78de21a824dcbfa5a8ab52c21fe7d71d5

  - Installing doctrine/dbal (dev-master cc2d503)
    Cloning cc2d50385efa1ea87f5d0afa2c47cc2499914f81

  - Installing doctrine/orm (2.4.x-dev 0cf7e0e)
    Cloning 0cf7e0e628c1409c9235c9b107c9623a2e8a80ef

doctrine/orm suggests installing symfony/yaml (If you want to use YAML Metadata Mapping Driver)
Writing lock file
Generating autoload files