1. tktcorporation

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    tktcorporation
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+bundle install 時、mysql2でエラー
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+#実行環境
+```
+$ sw_vers
+ProductName: Mac OS X
+ProductVersion: 10.14.2
+$ ruby -v
+ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
+$ rails -v
+Rails 5.1.2
+```
+
+#エラー内容
+
+gemfileに`gem 'mysql2'`を記述し`bundle install`を行うと下記のようなエラーが発生。
+
+```terminal
+
+Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
+
+ current directory: /Users/{username}/rails_app/test-mysql/vendor/bundle/gems/mysql2-0.5.2/ext/mysql2
+/Users/{username}/.rbenv/versions/2.5.1/bin/ruby -I /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/site_ruby/2.5.0 -r
+./siteconf20181226-54895-ler7vx.rb extconf.rb --with-ldflags\=-L/usr/local/opt/openssl/lib\
+--with-cppflags\=-I/usr/local/opt/openssl/include
+checking for rb_absint_size()... *** extconf.rb failed ***
+Could not create Makefile due to some reason, probably lack of necessary
+libraries and/or headers. Check the mkmf.log file for more details. You may
+need configuration options.
+
+Provided configuration options:
+ --with-opt-dir
+ --without-opt-dir
+ --with-opt-include
+ --without-opt-include=${opt-dir}/include
+ --with-opt-lib
+ --without-opt-lib=${opt-dir}/lib
+ --with-make-prog
+ --without-make-prog
+ --srcdir=.
+ --curdir
+ --ruby=/Users/{username}/.rbenv/versions/2.5.1/bin/$(RUBY_BASE_NAME)
+/Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file.
+(RuntimeError)
+You have to install development tools first.
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:541:in `try_link0'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:559:in `try_link'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:770:in `try_func'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:1057:in `block in have_func'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:947:in `block in checking_for'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:350:in `block (2 levels) in postpone'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:320:in `open'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:350:in `block in postpone'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:320:in `open'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:346:in `postpone'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:946:in `checking_for'
+ from /Users/{username}/.rbenv/versions/2.5.1/lib/ruby/2.5.0/mkmf.rb:1056:in `have_func'
+ from extconf.rb:25:in `<main>'
+
+To see why this extension failed to compile, please check the mkmf.log which can be found here:
+
+ /Users/{username}/rails_app/test-mysql/vendor/bundle/extensions/x86_64-darwin-17/2.5.0-static/mysql2-0.5.2/mkmf.log
+
+extconf failed, exit code 1
+
+Gem files will remain installed in /Users/{username}/rails_app/test-mysql/vendor/bundle/gems/mysql2-0.5.2 for inspection.
+Results logged to
+/Users/{username}/rails_app/test-mysql/vendor/bundle/extensions/x86_64-darwin-17/2.5.0-static/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' --source 'https://rubygems.org/'` succeeds before bundling.
+```
+
+#意味がなかったこと(直接解決には繋がらなかったこと)
+```
+$ xcode-select --install
+```
+=> すでに入っとるわ
+
+```
+$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include"
+```
+=>エラー、そして`/vendor/bundle/extensions/x86_64-darwin-17/2.5.0-static/mysql2-0.5.2/mkmf.log`に
+
+```
+clang: error: unsupported option '--with-cppflags=-I/usr/local/opt/openssl/include'
+```
+上記の記述。
+
+#解決策
+```
+$ bundle config --local build.mysql2 "--with-cppflags=-I/usr/local/opt/openssl/include"
+```
+または
+
+```
+$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl/lib"
+```
+
+の後に
+
+```
+$ bundle instal
+```
+```
+Bundle complete! 19 Gemfile dependencies, 80 gems now installed.
+Bundled gems are installed into `./vendor/bundle`
+```
+
+`"--with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include"`と、オプションを2つつけると通らないみたいですね。
+
+長い道のりであった...