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bundle install で `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/' と言われてうまくいかない

Last updated at Posted at 2022-08-22

時間ないので、雑に忘備録として、一旦あげておきます

問題

gem 'mysql2', '~> 0.5.3'

こんな感じでGemfileにmysql2を入れようとしたときに

bin/bundle install

って入れても

An error occurred while installing mysql2 (0.5.3), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  mysql2

こんなエラーが出るわけですよね。

書いてある通りに

gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/

と入れても

ld: library not found for -lssl

こんな感じでエラーが出るわけです。。。

解決法

オプションで次のように記述すると解決できました。

gem install mysql2 -v '0.5.3' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include

そしたらbundle installはうまくいくと思います。
-v '0.5.3'の部分は、自分のエラーに合わせたバージョンにするといいと思います。
例)バージョン0.5.1の場合→gem install mysql2 -v '0.5.1' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include

bin/bundle install
...
...
...
Bundle complete! 46 Gemfile dependencies, 138 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.

僕の場合はこんな感じでした。

環境

M1 Mac(2020)
Big Sur v.11.6.1

Rails 7.0.2.3
ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin20]

何か指摘があればお願いします。

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