自己安装了 PHP5.6.25 Composer install 问题一直解决不了。

]# composer install --prefer-dist
Do not run Composer as root/super user! See https://getcomposer.org/root for details
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 smartisan/follow dev-master -> satisfiable by smartisan/follow[dev-master].
• smartisan/follow dev-master requires laravel/laravel >= 5.1 -> no matching package found.

Potential causes:

• A typo in the package name
• The package is not available in a stable-enough version according to your minimum-stability setting
  see https://getcomposer.org/doc/04-schema.md#m... for more details.

Read https://getcomposer.org/doc/articles/troub... for further common problems.

卡这里好久了，能否告知怎么解决。谢谢各位大神。