Ruby 1.9.+ Rails mysql error webrick mysqllib.dll

I've copied libmysql.dll from this address:
 http://instantrails.rubyforge.org/svn/trunk/InstantRails-win/InstantRails/mysql/bin/ 

to ruby/bin and it works with mysql version: 5.1.30.

"from" : http://stackoverflow.com/questions/664725/anyone-got-ruby-to-work-with-mysql-5-1

uninitialized constant MysqlCompat::MysqlRes .... installing::: gem install mysql error ::

Re: Error: uninitialized constant MysqlCompat::MysqlRes

src:: http://www.ruby-forum.com/topic/192550

Posted by Raphael Petegrosso (Guest) 

on 16.10.2009 01:54 

I was having the same problem on Snow Leopard and, after some time I did the following:  
Removed all mysql gems I had:  gem uninstall mysql  

In my case I had to specify both mysql-dir and mysql-config (and -arch x86_64 to 64 bits)  export ARCHFLAGS="-arch i386 -arch x86_64" ; 

gem install --no-rdoc -- no-ri mysql -- --with-mysql-dir=/usr/local --with-mysql-config=/usr/ local/mysql/bin/mysql_config  

Hope it works

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