title: gem install with archflag and version mysql2
body: <p>frustrated. Is this wrong?</p>
  
  <p>env ARCHFLAGS="-arch x86_64" sudo gem install mysql2 --version '0.2.6' -- --with-mysql-config=/usr/local/mysql/bin/mysql_config</p>
  
  <p>want to install 0.2.6</p>
  
  <p>Why the hell it keeps installing 0.3.2????</p>