$composer global require "laravel/homestead=~2.0"
Changed current directory to /Users/connorleech/.composer
./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
    - Conclusion: don't install laravel/homestead v2.1.8
    - Conclusion: don't install laravel/homestead v2.1.7
    - Conclusion: don't install laravel/homestead v2.1.6
    - Conclusion: don't install laravel/homestead v2.1.5
    - Conclusion: don't install laravel/homestead v2.1.4
    - Conclusion: don't install laravel/homestead v2.1.3
    - Conclusion: don't install laravel/homestead v2.1.2
    - Conclusion: don't install laravel/homestead v2.1.1
    - Conclusion: don't install laravel/homestead v2.1.0
    - Conclusion: don't install laravel/homestead v2.0.17
    - Conclusion: don't install laravel/homestead v2.0.16
    - Conclusion: don't install laravel/homestead v2.0.15
    - Conclusion: don't install laravel/homestead v2.0.14
    - Conclusion: don't install laravel/homestead v2.0.13
    - Conclusion: don't install laravel/homestead v2.0.12
    - Conclusion: don't install laravel/homestead v2.0.11
    - Conclusion: don't install laravel/homestead v2.0.10
    - Conclusion: don't install laravel/homestead v2.0.9
    - Conclusion: don't install laravel/homestead v2.0.8
    - Conclusion: don't install laravel/homestead v2.0.7
    - Conclusion: don't install laravel/homestead v2.0.6
    - Conclusion: don't install laravel/homestead v2.0.5
    - Conclusion: don't install laravel/homestead v2.0.4
    - Conclusion: don't install laravel/homestead v2.0.3
    - Conclusion: don't install laravel/homestead v2.0.2
    - Conclusion: don't install laravel/homestead v2.0.1
    - Conclusion: remove symfony/console v3.0.1
    - Installation request for laravel/homestead ~2.0 -> satisfiable by laravel/homestead[v2.0.0,v2.0.1,v2.0.10,v2.0.11,v2.0.12,v2.0.13,v2.0.14,v2.0.15,v2.0.16,v2.0.17,v2.0.2,v2.0.3,v2.0.4,v2.0.5,v2.0.6,v2.0.7,v2.0.8,v2.0.9,v2.1.0,v2.1.1,v2.1.2,v2.1.3,v2.1.4,v2.1.5,v2.1.6,v2.1.7,v2.1.8].
    - Conclusion: don't install symfony/console v3.0.1
    - laravel/homestead v2.0.0 requires symfony/console ~2.0 -> satisfiable by symfony/console[2.0.4,2.0.5,2.0.6,2.0.7,v2.0.18,v2.0.19,v2.0.20,v2.0.21,v2.0.22,v2.0.23,v2.0.24,v2.0.25,v2.1.10,v2.1.11,v2.1.12,v2.1.13,v2.1.8,v2.1.9,v2.2.0,v2.2.1,v2.2.10,v2.2.11,v2.2.2,v2.2.3,v2.2.4,v2.2.5,v2.2.6,v2.2.7,v2.2.8,v2.2.9,v2.3.0,v2.3.1,v2.3.10,v2.3.11,v2.3.12,v2.3.13,v2.3.14,v2.3.15,v2.3.16,v2.3.17,v2.3.18,v2.3.19,v2.3.2,v2.3.20,v2.3.21,v2.3.22,v2.3.23,v2.3.24,v2.3.25,v2.3.26,v2.3.27,v2.3.28,v2.3.29,v2.3.3,v2.3.30,v2.3.31,v2.3.32,v2.3.33,v2.3.34,v2.3.35,v2.3.36,v2.3.4,v2.3.5,v2.3.6,v2.3.7,v2.3.8,v2.3.9,v2.4.0,v2.4.1,v2.4.10,v2.4.2,v2.4.3,v2.4.4,v2.4.5,v2.4.6,v2.4.7,v2.4.8,v2.4.9,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,v2.6.0,v2.6.1,v2.6.10,v2.6.11,v2.6.12,v2.6.2,v2.6.3,v2.6.4,v2.6.5,v2.6.6,v2.6.7,v2.6.8,v2.6.9,v2.7.0,v2.7.1,v2.7.2,v2.7.3,v2.7.4,v2.7.5,v2.7.6,v2.7.7,v2.7.8,v2.8.0,v2.8.1].
    - Can only install one of: symfony/console[v2.3.0,v3.0.1].
    - Can only install one of: symfony/console[v2.3.1,v3.0.1].
    - Can only install one of: symfony/console[v2.3.10,v3.0.1].
    - Can only install one of: symfony/console[v2.3.11,v3.0.1].
    - Can only install one of: symfony/console[v2.3.12,v3.0.1].
    - Can only install one of: symfony/console[v2.3.13,v3.0.1].
    - Can only install one of: symfony/console[v2.3.14,v3.0.1].
    - Can only install one of: symfony/console[v2.3.15,v3.0.1].
    - Can only install one of: symfony/console[v2.3.16,v3.0.1].
    - Can only install one of: symfony/console[v2.3.17,v3.0.1].
    - Can only install one of: symfony/console[v2.3.18,v3.0.1].
    - Can only install one of: symfony/console[v2.3.19,v3.0.1].
    - Can only install one of: symfony/console[v2.3.2,v3.0.1].
    - Can only install one of: symfony/console[v2.3.20,v3.0.1].
    - Can only install one of: symfony/console[v2.3.21,v3.0.1].
    - Can only install one of: symfony/console[v2.3.22,v3.0.1].
    - Can only install one of: symfony/console[v2.3.23,v3.0.1].
    - Can only install one of: symfony/console[v2.3.24,v3.0.1].
    - Can only install one of: symfony/console[v2.3.25,v3.0.1].
    - Can only install one of: symfony/console[v2.3.26,v3.0.1].
    - Can only install one of: symfony/console[v2.3.27,v3.0.1].
    - Can only install one of: symfony/console[v2.3.28,v3.0.1].
    - Can only install one of: symfony/console[v2.3.29,v3.0.1].
    - Can only install one of: symfony/console[v2.3.3,v3.0.1].
    - Can only install one of: symfony/console[v2.3.30,v3.0.1].
    - Can only install one of: symfony/console[v2.3.31,v3.0.1].
    - Can only install one of: symfony/console[v2.3.32,v3.0.1].
    - Can only install one of: symfony/console[v2.3.33,v3.0.1].
    - Can only install one of: symfony/console[v2.3.34,v3.0.1].
    - Can only install one of: symfony/console[v2.3.35,v3.0.1].
    - Can only install one of: symfony/console[v2.3.36,v3.0.1].
    - Can only install one of: symfony/console[v2.3.4,v3.0.1].
    - Can only install one of: symfony/console[v2.3.5,v3.0.1].
    - Can only install one of: symfony/console[v2.3.6,v3.0.1].
    - Can only install one of: symfony/console[v2.3.7,v3.0.1].
    - Can only install one of: symfony/console[v2.3.8,v3.0.1].
    - Can only install one of: symfony/console[v2.3.9,v3.0.1].
    - Can only install one of: symfony/console[v2.4.0,v3.0.1].
    - Can only install one of: symfony/console[v2.4.1,v3.0.1].
    - Can only install one of: symfony/console[v2.4.10,v3.0.1].
    - Can only install one of: symfony/console[v2.4.2,v3.0.1].
    - Can only install one of: symfony/console[v2.4.3,v3.0.1].
    - Can only install one of: symfony/console[v2.4.4,v3.0.1].
    - Can only install one of: symfony/console[v2.4.5,v3.0.1].
    - Can only install one of: symfony/console[v2.4.6,v3.0.1].
    - Can only install one of: symfony/console[v2.4.7,v3.0.1].
    - Can only install one of: symfony/console[v2.4.8,v3.0.1].
    - Can only install one of: symfony/console[v2.4.9,v3.0.1].
    - Can only install one of: symfony/console[v2.5.0,v3.0.1].
    - Can only install one of: symfony/console[v2.5.1,v3.0.1].
    - Can only install one of: symfony/console[v2.5.10,v3.0.1].
    - Can only install one of: symfony/console[v2.5.11,v3.0.1].
    - Can only install one of: symfony/console[v2.5.12,v3.0.1].
    - Can only install one of: symfony/console[v2.5.2,v3.0.1].
    - Can only install one of: symfony/console[v2.5.3,v3.0.1].
    - Can only install one of: symfony/console[v2.5.4,v3.0.1].
    - Can only install one of: symfony/console[v2.5.5,v3.0.1].
    - Can only install one of: symfony/console[v2.5.6,v3.0.1].
    - Can only install one of: symfony/console[v2.5.7,v3.0.1].
    - Can only install one of: symfony/console[v2.5.8,v3.0.1].
    - Can only install one of: symfony/console[v2.5.9,v3.0.1].
    - Can only install one of: symfony/console[v2.6.0,v3.0.1].
    - Can only install one of: symfony/console[v2.6.1,v3.0.1].
    - Can only install one of: symfony/console[v2.6.10,v3.0.1].
    - Can only install one of: symfony/console[v2.6.11,v3.0.1].
    - Can only install one of: symfony/console[v2.6.12,v3.0.1].
    - Can only install one of: symfony/console[v2.6.2,v3.0.1].
    - Can only install one of: symfony/console[v2.6.3,v3.0.1].
    - Can only install one of: symfony/console[v2.6.4,v3.0.1].
    - Can only install one of: symfony/console[v2.6.5,v3.0.1].
    - Can only install one of: symfony/console[v2.6.6,v3.0.1].
    - Can only install one of: symfony/console[v2.6.7,v3.0.1].
    - Can only install one of: symfony/console[v2.6.8,v3.0.1].
    - Can only install one of: symfony/console[v2.6.9,v3.0.1].
    - Can only install one of: symfony/console[v2.7.0,v3.0.1].
    - Can only install one of: symfony/console[v2.7.1,v3.0.1].
    - Can only install one of: symfony/console[v2.7.2,v3.0.1].
    - Can only install one of: symfony/console[v2.7.3,v3.0.1].
    - Can only install one of: symfony/console[v2.7.4,v3.0.1].
    - Can only install one of: symfony/console[v2.7.5,v3.0.1].
    - Can only install one of: symfony/console[v2.7.6,v3.0.1].
    - Can only install one of: symfony/console[v2.7.7,v3.0.1].
    - Can only install one of: symfony/console[v2.7.8,v3.0.1].
    - Can only install one of: symfony/console[v2.8.0,v3.0.1].
    - Can only install one of: symfony/console[v2.8.1,v3.0.1].
    - Can only install one of: symfony/console[2.0.4,v3.0.1].
    - Can only install one of: symfony/console[2.0.5,v3.0.1].
    - Can only install one of: symfony/console[2.0.6,v3.0.1].
    - Can only install one of: symfony/console[2.0.7,v3.0.1].
    - Can only install one of: symfony/console[v2.0.10,v3.0.1].
    - Can only install one of: symfony/console[v2.0.12,v3.0.1].
    - Can only install one of: symfony/console[v2.0.13,v3.0.1].
    - Can only install one of: symfony/console[v2.0.14,v3.0.1].
    - Can only install one of: symfony/console[v2.0.15,v3.0.1].
    - Can only install one of: symfony/console[v2.0.16,v3.0.1].
    - Can only install one of: symfony/console[v2.0.17,v3.0.1].
    - Can only install one of: symfony/console[v2.0.18,v3.0.1].
    - Can only install one of: symfony/console[v2.0.19,v3.0.1].
    - Can only install one of: symfony/console[v2.0.20,v3.0.1].
    - Can only install one of: symfony/console[v2.0.21,v3.0.1].
    - Can only install one of: symfony/console[v2.0.22,v3.0.1].
    - Can only install one of: symfony/console[v2.0.23,v3.0.1].
    - Can only install one of: symfony/console[v2.0.24,v3.0.1].
    - Can only install one of: symfony/console[v2.0.25,v3.0.1].
    - Can only install one of: symfony/console[v2.0.9,v3.0.1].
    - Can only install one of: symfony/console[v2.1.0,v3.0.1].
    - Can only install one of: symfony/console[v2.1.1,v3.0.1].
    - Can only install one of: symfony/console[v2.1.10,v3.0.1].
    - Can only install one of: symfony/console[v2.1.11,v3.0.1].
    - Can only install one of: symfony/console[v2.1.12,v3.0.1].
    - Can only install one of: symfony/console[v2.1.13,v3.0.1].
    - Can only install one of: symfony/console[v2.1.2,v3.0.1].
    - Can only install one of: symfony/console[v2.1.3,v3.0.1].
    - Can only install one of: symfony/console[v2.1.4,v3.0.1].
    - Can only install one of: symfony/console[v2.1.5,v3.0.1].
    - Can only install one of: symfony/console[v2.1.6,v3.0.1].
    - Can only install one of: symfony/console[v2.1.7,v3.0.1].
    - Can only install one of: symfony/console[v2.1.8,v3.0.1].
    - Can only install one of: symfony/console[v2.1.9,v3.0.1].
    - Can only install one of: symfony/console[v2.2.0,v3.0.1].
    - Can only install one of: symfony/console[v2.2.1,v3.0.1].
    - Can only install one of: symfony/console[v2.2.10,v3.0.1].
    - Can only install one of: symfony/console[v2.2.11,v3.0.1].
    - Can only install one of: symfony/console[v2.2.2,v3.0.1].
    - Can only install one of: symfony/console[v2.2.3,v3.0.1].
    - Can only install one of: symfony/console[v2.2.4,v3.0.1].
    - Can only install one of: symfony/console[v2.2.5,v3.0.1].
    - Can only install one of: symfony/console[v2.2.6,v3.0.1].
    - Can only install one of: symfony/console[v2.2.7,v3.0.1].
    - Can only install one of: symfony/console[v2.2.8,v3.0.1].
    - Can only install one of: symfony/console[v2.2.9,v3.0.1].
    - Installation request for symfony/console == 3.0.1.0 -> satisfiable by symfony/console[v3.0.1].


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

这些是我正在运行的版本.

$composer --version
Composer version 1.0-dev (d6ae9a0529e1f39c4c7f9b2f29fff019d79cd1fb) 2015-12-22 20:44:41
$laravel --version
Laravel Installer version 1.3.1
$PHP --version
PHP 5.5.30 (cli) (built: Oct 23 2015 17:21:45) 
$vagrant --version
Vagrant 1.8.1