In Gemfile: mysql2 エラーへの対応。

エラー全体

/private/var/folders/xt/149l2dks7ns2rz9j6ytm7m8c0000gn/T/bundler20200804-35301-1kchfhimysql2-0.5.3/gems/mysql2-0.5.3/ext/mysql2
make "DESTDIR="
compiling client.c
compiling infile.c
compiling mysql2_ext.c
compiling result.c
compiling statement.c
linking shared-object mysql2/mysql2.bundle
ld: warning: directory not found for option
'-L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.Internal.sdk/usr/local/lib'
ld: library not found for -lssl
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1
make failed, exit code 2
Gem files will remain installed in
/var/folders/xt/149l2dks7ns2rz9j6ytm7m8c0000gn/T/bundler20200804-35301-1kchfhimysql2-0.5.3/gems/mysql2-0.5.3
for inspection.
Results logged to
/var/folders/xt/149l2dks7ns2rz9j6ytm7m8c0000gn/T/bundler20200804-35301-1kchfhimysql2-0.5.3/extensions/universal-darwin-19/2.6.0/mysql2-0.5.3/gem_make.out
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

エラーの箇所

An error occurred while installing mysql2 (0.5.3), and Bundler cannot
continue.

解決方法

Gemfileの記載内容を変更

変更前

gem 'mysql2'

変更後

gem 'mysql2', '~>0.5.3'

参考記事