mastodonのbundle installでエラー

An error occurred while installing cld3 (3.2.3), and Bundler cannot continue. Make sure that `gem install cld3 -v '3.2.3' --source 'https://rubygems.org/'` succeeds before bundling.

gem 'cld3 'が入らない。
ターミナルの出力を試すもエラー。

$ gem install cld3 -v '3.2.3' --source 'https://rubygems.org/'
Fetching cld3-3.2.3.gem
Fetching ffi-1.9.25.gem
Building native extensions. This could take a while...
Successfully installed ffi-1.9.25
Building native extensions. This could take a while...
ERROR:  Error installing cld3:
	ERROR: Failed to build gem native extension.

An error occurred while installing cld3 (3.2.3), and Bundler cannot continue. Make sure that `gem install cld3 -v '3.2.3' --source 'https://rubygems.org/'` succeeds before bundling.の【解決コピペコード】

& brew install protobuf

==> Downloading https://homebrew.bintray.com/bottles/protobuf-3.7.1.mojave.bottle.1.tar.gz
==> Downloading from https://akamai.bintray.com/41/410f34fc3240dc94c16bf74e3317b56d987acddc361228c03e6b10e8373588fb?__gda__=exp=1566130248~hmac=642c7bdd88089e35b5a9443d7567bd783a
######################################################################## 100.0%
==> Pouring protobuf-3.7.1.mojave.bottle.1.tar.gz
🍺  /usr/local/Cellar/protobuf/3.7.1: 374 files, 21.3MB
MacBook-Pro-4:mastodon jun$ brew install protobuf-compiler

入った！！！

$ bundle install --path=vendor/bundle


Fetching cld3 3.2.3
Installing cld3 3.2.3 with native extensions
Fetching connection_pool 2.2.2
Installing connection_pool 2.2.2
Fetching safe_yaml 1.0.4
Installing safe_yaml 1.0.4
Fetching crack 0.4.3
Installing crack 0.4.3
Fetching css_parser 1.6.0
Installing css_parser 1.6.0
Fetching get_process_mem 0.2.3
Installing get_process_mem 0.2.3

キターーーーーーーーーーーーーーーーーーーーーーーーーーーーーーー🎉🎉🎉🎉🎉

参考
http://31webcreation.hatenablog.com/entry/2018/03/26/223926
https://qiita.com/k-yamada-github/items/a748a5ea4aafdcd3cee2