yeeunkwak@yeeunui-MacBookAir ~ % flutter doctor

zsh: command not found: flutter

yeeunkwak@yeeunui-MacBookAir ~ % brew install cocoapods

sudo gem install cocoapods

zsh: command not found: brew

ERROR: Error installing cocoapods:

The last version of drb (>= 0) to support your Ruby & RubyGems was 2.0.6. Try installing it with `gem install drb -v 2.0.6` and then running the current command again

drb requires Ruby version >= 2.7.0. The current ruby version is 2.6.10.210.

yeeunkwak@yeeunui-MacBookAir ~ % 

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터미널에 flutter doctor치면 위와같은 문구가 뜨는데,

어떻게 해결할 수 있을까요?

cocoapods가 설치가 안된거 같은데 ㅠㅠ 이유와 해결방법 있을까요

(homebrew 설치는 성공했습니다)