mysql2 error

mysql2 をインストールしようとしたらエラーが出た（いつものやつ）。

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

...

checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_gc_mark_movable()... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_enc_interned_str() in ruby.h... yes
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Using --with-openssl-dir=/opt/homebrew/opt/openssl@3
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Using mysql_config at /opt/homebrew/bin/mysql_config
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checking for mysql.h... yes
checking for errmsg.h... yes
checking for SSL_MODE_DISABLED in mysql.h... yes
checking for SSL_MODE_PREFERRED in mysql.h... yes
checking for SSL_MODE_REQUIRED in mysql.h... yes
checking for SSL_MODE_VERIFY_CA in mysql.h... yes
checking for SSL_MODE_VERIFY_IDENTITY in mysql.h... yes
checking for MYSQL.net.vio in mysql.h... yes
checking for MYSQL.net.pvio in mysql.h... no
checking for MYSQL_DEFAULT_AUTH in mysql.h... yes
checking for MYSQL_ENABLE_CLEARTEXT_PLUGIN in mysql.h... yes
checking for SERVER_QUERY_NO_GOOD_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_NO_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_WAS_SLOW in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_ON in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_OFF in mysql.h... yes
checking for my_bool in mysql.h... no
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Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load
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Setting libpath to /opt/homebrew/Cellar/mysql/8.2.0_1/lib
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creating Makefile

...

linking shared-object mysql2/mysql2.bundle
ld: warning: ignoring duplicate libraries: '-lruby.3.2'
ld: library 'zstd' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1

...

An error occurred while installing mysql2 (0.5.5), and Bundler cannot continue.

最新の mysql 8.2 をインストールしていることが問題のようだ。

なので、 mysql 5.7 をインストールする。

$ brew install mysql@5.7

mysql 5.7 のほうにパスを通して、bundle install する。

$ PATH="/opt/homebrew/opt/mysql@5.7/bin:$PATH" bundle install
Bundle complete! 3 Gemfile dependencies, 48 gems now installed.
Use `bundle info [gemname]` to see where a bundled gem is installed.

成功した。

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