OSX で mysql5.6 環境下で mysql/mysql2 gem のインストールエラーがでた。


Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

/Users/.../bin/ruby extconf.rb --with-mysql-config=/usr/lo
cal/mysql/bin/mysql_config
checking for mysql_ssl_set()... no
checking for rb_str_set_len()... no
checking for rb_thread_start_timer()... no
checking for mysql.h... no
checking for mysql/mysql.h... no
*** 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
…