我尝试使用composer将google php api客户端安装到我现有的php应用程序时遇到了一些问题。我使用以下命令安装：
composer require google/apiclient:^2.0.0@RC
我得到的错误：
./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
- google/apiclient v2.0.0-RC3 requires guzzlehttp/guzzle 5.2.* -> satisfiable by guzzlehttp/guzzle[5.2.0] but these conflict with your requirements or minimum-stability.
- google/apiclient v2.0.0-RC2 requires guzzlehttp/guzzle 5.2.* -> satisfiable by guzzlehttp/guzzle[5.2.0] but these conflict with your requirements or minimum-stability.
- google/apiclient v2.0.0-RC1 requires guzzlehttp/guzzle 5.2.* -> satisfiable by guzzlehttp/guzzle[5.2.0] but these conflict with your requirements or minimum-stability.
- google/apiclient v2.0.0-RC8 requires google/auth 0.8 -> satisfiable by google/auth[v0.8].
- Conclusion: don't install google/auth v0.8
- Installation request for guzzlehttp/psr7 (locked at 1.3.0) -> satisfiable by guzzlehttp/psr7[1.3.0].
- google/apiclient v2.0.0-RC6 requires google/auth 0.7 -> satisfiable by google/auth[v0.7].
- google/apiclient v2.0.0-RC7 requires google/auth 0.7 -> satisfiable by google/auth[v0.7].
- Conclusion: don't install google/auth v0.7
- google/apiclient v2.0.0-RC4 requires google/auth 0.5 -> satisfiable by google/auth[v0.5].
- google/apiclient v2.0.0-RC5 requires google/auth 0.5 -> satisfiable by google/auth[v0.5].
- Conclusion: don't install google/auth v0.5
- Installation request for google/apiclient ^2.0.0@RC -> satisfiable by google/apiclient[v2.0.0-RC1, v2.0.0-RC2, v2.0.0-RC3, v2.0.0-RC4, v2.0.0-RC5, v2.0.0-RC6, v2.0.0-RC7, v2.0.0-RC8].
Installation failed, reverting ./composer.json to its original content.
从谷歌php api客户端要求它说它支持guzzle 6.任何想法可能是什么问题？
我尝试安装最新版本的google/auth 0.8，但遇到了类似的问题：
- Conclusion: remove guzzlehttp/psr7 1.3.0
- Conclusion: don't install guzzlehttp/psr7 1.3.0
- google/auth v0.8 requires guzzlehttp/psr7 1.2.* -> satisfiable by guzzlehttp/psr7[1.2.0, 1.2.1, 1.2.2, 1.2.3].
- Can only install one of: guzzlehttp/psr7[1.2.0, 1.3.0].
- Installation request for guzzlehttp/psr7 (locked at 1.3.0) -> satisfiable by guzzlehttp/psr7[1.3.0]