Drush無法安裝：您的要求無法解析爲可安裝的一組套件

我已根據https://getcomposer.org/doc/00-intro.md#globally上的說明安裝了全球作曲家，然後嘗試安裝drush。不幸的是，drush未能安裝給出以下錯誤：Drush無法安裝：您的要求無法解析爲可安裝的一組套件

composer install 
Loading composer repositories with package information 
Installing dependencies (including require-dev) from lock file 
Your requirements could not be resolved to an installable set of packages. 

    Problem 1 
    - Installation request for symfony/console v3.0.1 -> satisfiable by symfony/console[v3.0.1]. 
    - symfony/console v3.0.1 requires php >=5.5.9 -> your PHP version (5.4.16) or value of "config.platform.php" in composer.json does not satisfy that requirement. 
    Problem 2 
    - symfony/console v3.0.1 requires php >=5.5.9 -> your PHP version (5.4.16) or value of "config.platform.php" in composer.json does not satisfy that requirement. 
    - psy/psysh v0.6.1 requires symfony/console ~2.3.10|^2.4.2|~3.0 -> satisfiable by symfony/console[v3.0.1]. 
    - Installation request for psy/psysh v0.6.1 -> satisfiable by psy/psysh[v0.6.1].

即使http://docs.drush.org/en/master/install列表：

Drush 8 master PHP 5.4.5+

我的環境是：

CentOS Linux release 7.2.1511 (Core) 
php -v 
PHP 5.4.16 (cli) (built: Jun 23 2015 21:17:27) 
Copyright (c) 1997-2013 The PHP Group 
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

，不幸的是我不能升級PHP因爲我需要嚴格遵循RHEL/CentOS官方版本。

然後，我決定試用一下Drush 7.x的分支，不幸的是還贈送：

composer install 
Loading composer repositories with package information 
Installing dependencies (including require-dev) from lock file 
Your requirements could not be resolved to an installable set of packages. 

Problem 1 
- Installation request for symfony/console v3.0.1 -> satisfiable by symfony/console[v3.0.1]. 
- symfony/console v3.0.1 requires php >=5.5.9 -> your PHP version (5.4.16) or value of "config.platform.php" in composer.json does not satisfy that requirement. 
Problem 2 
- symfony/console v3.0.1 requires php >=5.5.9 -> your PHP version (5.4.16) or value of "config.platform.php" in composer.json does not satisfy that requirement. 
- psy/psysh v0.6.1 requires symfony/console ~2.3.10|^2.4.2|~3.0 -> satisfiable by symfony/console[v3.0.1]. 
- Installation request for psy/psysh v0.6.1 -> satisfiable by psy/psysh[v0.6.1].

我應該在這種情況下怎麼辦？

來源

2016-01-18 Nick

你試過這樣嗎？這樣做對最新的HEAD版本：

composer global require drush/drush:dev-master

如果你想要一個特定版本做到這一點，例如第7版的最新版本：

composer global require drush/drush:7.*

來源

2016-01-26 10:30:18

是的，我做到了，但不幸的是它出上述描述的依賴。我手動符號鏈接到drush命令的路徑是可執行的，它現在正在爲我工作，但「官方」安裝方式仍然失敗。 – Nick

Drush無法安裝：您的要求無法解析爲可安裝的一組套件

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