gem install with archflag and version mysql2

frustrated. Is this wrong?

env ARCHFLAGS="-arch x86_64" sudo gem install mysql2 --version '0.2.6' -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

want to ins开发者_如何学Gotall 0.2.6

Why the hell it keeps installing 0.3.2????

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env ARCHFLAGS="-arch x86_64" sudo gem install mysql2 --version '=0.2.6' -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

note the

--version '=0.2.6'

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hm so it should be '= 0.2.6'

But now I got

Please install the mysql2 adapter: gem install activerecord-mysql2-adapter

Alrighty time to reinstall everything... again