Composer + Rocketeer + ZF2- Cannot install Rocketeer due to requirements conflict

Question

Can somebody can tell me how to fix this?

Rocketeer installs just fine in empty dir, but not along with my existing project, don't know w why.

What is requiering that installation?

 - Installation request for symfony/console == 2.6.6.0 -> satisfiable by symfony/console[v2.6.6].

composer.json

{
    "name": "zendframework/skeleton-application",
    "description": "Skeleton Application for ZF2",
    "license": "BSD-3-Clause",
    "keywords": [
        "framework",
        "zf2"
    ],
    "homepage": "http://framework.zend.com/",
    "require": {
        "php": ">=5.3.3",
        "zendframework/zendframework": "~2.3",
        "doctrine/doctrine-module": "dev-master",
        "doctrine/doctrine-orm-module": "dev-master",
        "zendframework/zend-developer-tools": "dev-master",
        "mandrill/mandrill": "1.0.*"
    }
}

command

composer require anahkiasen/rocketeer

output

Using version ^2.2 for anahkiasen/rocketeer
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for anahkiasen/rocketeer ^2.2 -> satisfiable by anahkiasen/rocketeer[2.2.0].
    - Conclusion: remove symfony/console v2.6.6
    - Conclusion: don't install symfony/console v2.6.6
    - anahkiasen/rocketeer 2.2.0 requires illuminate/console ~4.2 -> satisfiable by illuminate/console[v4.2.1, v4.2.12, v4.2.16, v4.2.17, v4.2.2, v4.2.3, v4.2.4, v4.2.5, v4.2.6, v4.2.7, v4.2.8, v4.2.9].
    - illuminate/console v4.2.1 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.12 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.16 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.17 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.2 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.3 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.4 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.5 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.6 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.7 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.8 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - illuminate/console v4.2.9 requires symfony/console 2.5.* -> satisfiable by symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.11, v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9].
    - Can only install one of: symfony/console[v2.5.0, v2.6.6].
    - Can only install one of: symfony/console[v2.5.1, v2.6.6].
    - Can only install one of: symfony/console[v2.5.10, v2.6.6].
    - Can only install one of: symfony/console[v2.5.11, v2.6.6].
    - Can only install one of: symfony/console[v2.5.12, v2.6.6].
    - Can only install one of: symfony/console[v2.5.2, v2.6.6].
    - Can only install one of: symfony/console[v2.5.3, v2.6.6].
    - Can only install one of: symfony/console[v2.5.4, v2.6.6].
    - Can only install one of: symfony/console[v2.5.5, v2.6.6].
    - Can only install one of: symfony/console[v2.5.6, v2.6.6].
    - Can only install one of: symfony/console[v2.5.7, v2.6.6].
    - Can only install one of: symfony/console[v2.5.8, v2.6.6].
    - Can only install one of: symfony/console[v2.5.9, v2.6.6].
    - Installation request for symfony/console == 2.6.6.0 -> satisfiable by symfony/console[v2.6.6].


Installation failed, reverting ./composer.json to its original content.

Answer 1

Why doesn't it install?

The installed dependencies of the Zend Skeleton use symfony/console in version 2.6.6.

"anahkiasen/rocketeer" requires "illuminate/console" in a version ~4.2, which itself requires "symfony/console" in version 2.5.*.

Composer cannot install the new package because the installed version 2.6.6 of symfony/console will be kept, but is incompatible to the requirement of the depencencies of the new package (2.5.* does not allow version 2.6.6).

You can try to manually add your new package and then run composer update. If by chance the skeleton package would also allow symfony/console in version 2.5, this would resolve to an installable set of packages.