无法安装mysql2 gem。 安装找不到mysql.h

Question

I am trying to install mysql2:

sudo gem install mysql2 -v '0.2.7' -- --with-mysql-config=/usr/local/Cellar/mysql/5.5.25a/bin/mysql_config

I'm getting this error:

ERROR:  Error installing mysql2:
    ERROR: Failed to build gem native extension.

       /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb --    with-mysql-config=/usr/local/Cellar/mysql/5.5.25a/bin/mysql_config
checking for rb_thread_blocking_region()... no
checking for mysql.h... no
checking for mysql/mysql.h... no
-----
mysql.h is missing.  please check your installation of mysql and try again.
-----
*** 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.

my mysql install is via brew so my mysql.h file is located at:

/usr/local/Cellar/mysql/5.5.25a/bin/mysql_config

which is why I have the with-mysql-config flag

The mysql_config file is looking for the mysql.h file here:

$basedir/include/mysql/mysql.h

it should be added that I updated my gemfile from

gem 'mysql2

to gem 'mysql2', '0.2.7'

because, I was getting some deprecation warning about the fact that mysql2 0.3.* didn't have active record support. So would either have to upgrade rails to 3.1 or downgrade mysql2. I chose the latter.

Should I edit the mysql_config or is there something else I can do to fix this? Thanks for any help.

Answer 1

I realise this is an old question but for anyone coming here from google I found this solution worked for me: http://www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html .

The short version is to remove compiler flags -Wno-null-conversion -Wno-unused-private-field from /usr/local/Cellar/mysql/5.6.12/bin/mysql_config around line 120 (replace mysql version with whatever you have to find the file).

I'm on OSX with homebrew mysql and rvm using ruby 1.9.3.

Answer 2

您应该安装mysql-dev软件包，这是一些用于编译本机驱动程序的头文件。