如何在每个项目的基础上使用system Ruby而不是rbenv?

这个项目是自制的,我运行的命令是 brew style . 当我在本地运行该命令时,会得到以下结果:

Ignoring rainbow-2.2.2 because its extensions are not built.  Try: gem pristine rainbow --version 2.2.2
/usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- rainbow (LoadError)
from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/richie.thomas/.gem/ruby/2.3.0/gems/rubocop-0.50.0/lib/rubocop.rb:4:in `<top (required)>'
from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /usr/local/Homebrew/Library/Homebrew/vendor/portable-ruby/2.3.3/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Users/richie.thomas/.gem/ruby/2.3.0/gems/rubocop-0.50.0/bin/rubocop:6:in `<top (required)>'
from /Users/richie.thomas/.gem/ruby/2.3.0/bin/rubocop:22:in `load'
from /Users/richie.thomas/.gem/ruby/2.3.0/bin/rubocop:22:in `<main>'

gem environment 返回以下内容:

RubyGems Environment:
  - RUBYGEMS VERSION: 2.6.10
  - RUBY VERSION: 2.3.3 (2016-11-21 patchlevel 222) [x86_64-darwin15]
  - INSTALLATION DIRECTORY: /Users/richie.thomas/.rbenv/versions/2.3.3/lib/ruby/gems/2.3.0
  - USER INSTALLATION DIRECTORY: /Users/richie.thomas/.gem/ruby/2.3.0
  - RUBY EXECUTABLE: /Users/richie.thomas/.rbenv/versions/2.3.3/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/richie.thomas/.rbenv/versions/2.3.3/bin
  - SPEC CACHE DIRECTORY: /Users/richie.thomas/.gem/specs
....

rbenv documentation 这提到了这一点。

是否有任何一次性命令可以运行,或任何配置设置可以更改,以便我可以做我需要做的事情?