Q&A
直接の回答ではないのですが、MacOSの御利用でしょうか。
タグへ御利用のOSと、質問へ利用しているパッケージシステムなども記載されたほうが回答が得られやすいと思います。
/usr/local/opt
とかの記載があるので、mysqlのインストール方法も何でインストールしたのか詳細あった方が解決に至る回答得られやすいと思います。
###環境
macOS Mojave ver.10.14.5
rails 5.2.4
ruby 2.3.7
mysql
Gemfileに以下を追記して
gem 'mysql2', '>= 0.4.4', '< 0.6.0'
bundle installすると、エラーが発生します。
Fetching mysql2 0.5.2 Installing mysql2 0.5.2 with native extensions Gem::Ext::BuildError: ERROR: Failed to build gem native extension. current directory: /Users/username/Desktop/myapp/sua3/vendor/bundle/ruby/2.3.0/gems/mysql2-0.5.2/ext/mysql2 /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -r ./siteconf20190625-18677-3nt4j6.rb extconf.rb checking for rb_absint_size()... yes checking for rb_absint_singlebit_p()... yes checking for rb_wait_for_single_fd()... yes ----- Using mysql_config at /usr/local/opt/mysql@5.7/bin/mysql_config ----- 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_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... yes ----- Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load ----- ----- Setting libpath to /usr/local/opt/mysql@5.7/lib ----- creating Makefile To see why this extension failed to compile, please check the mkmf.log which can be found here: /Users/username/Desktop/myapp/sua3/vendor/bundle/ruby/2.3.0/extensions/universal-darwin-18/2.3.0/mysql2-0.5.2/mkmf.log current directory: /Users/username/Desktop/myapp/sua3/vendor/bundle/ruby/2.3.0/gems/mysql2-0.5.2/ext/mysql2 make "DESTDIR=" clean current directory: /Users/username/Desktop/myapp/sua3/vendor/bundle/ruby/2.3.0/gems/mysql2-0.5.2/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: 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 /Users/username/Desktop/myapp/sua3/vendor/bundle/ruby/2.3.0/gems/mysql2-0.5.2 for inspection. Results logged to /Users/username/Desktop/myapp/sua3/vendor/bundle/ruby/2.3.0/extensions/universal-darwin-18/2.3.0/mysql2-0.5.2/gem_make.out An error occurred while installing mysql2 (0.5.2), and Bundler cannot continue. Make sure that `gem install mysql2 -v '0.5.2'` succeeds before bundling. In Gemfile: mysql2
言われた通り、
sudo gem install mysql2 -v '0.5.2'
を実行すると、以下のようなエラーが帰ってきます。
Building native extensions. This could take a while... ERROR: Error installing mysql2: ERROR: Failed to build gem native extension. current directory: /Library/Ruby/Gems/2.3.0/gems/mysql2-0.5.2/ext/mysql2 /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -r ./siteconf20190625-21587-nu1l84.rb extconf.rb checking for rb_absint_size()... yes checking for rb_absint_singlebit_p()... yes checking for rb_wait_for_single_fd()... yes ----- Using mysql_config at /usr/local/opt/mysql@5.7/bin/mysql_config ----- 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_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... yes ----- Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load ----- ----- Setting libpath to /usr/local/opt/mysql@5.7/lib ----- creating Makefile To see why this extension failed to compile, please check the mkmf.log which can be found here: /Library/Ruby/Gems/2.3.0/extensions/universal-darwin-18/2.3.0/mysql2-0.5.2/mkmf.log current directory: /Library/Ruby/Gems/2.3.0/gems/mysql2-0.5.2/ext/mysql2 make "DESTDIR=" clean current directory: /Library/Ruby/Gems/2.3.0/gems/mysql2-0.5.2/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: 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 /Library/Ruby/Gems/2.3.0/gems/mysql2-0.5.2 for inspection. Results logged to /Library/Ruby/Gems/2.3.0/extensions/universal-darwin-18/2.3.0/mysql2-0.5.2/gem_make.out
どのようにすれば、mysql2をインストールできるでしょうか。
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