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I just recently reinstalled my MacBook Pro, this time with Snow Leopard.

So I'm again going through various installation problems I already forgot about from few years back when I installed Leopard.

Anyway, just had to hunt down a problem with mysql gem installation on Snow Leopard.

Apparently if you just do 'gem install mysql' it seems to install fine, but doesn't work.

You get "uninitialized constant MysqlCompat::MysqlRes" error when trying to run rails.

The solution is to pass it some arguments for installation:

ARCHFLAGS="-arch x86_64" gem install mysql -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

Oh, and of course install 64bit mysql version before that. I usually just download the binaries from mysql.com.

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