I have to say that MySQL 5.5 is pretty new to me, BUT - its a whole new game. First, InnoDB is now the default DB Engine not MyISAM.
They have substantially how things work both externally and internally. The fact those folders don't exist is indicative of that. Read this next link and read the part about pluginshttp://dev.mysql.com/doc/refman/5.5/en/ ... eries.html
This section contains info about 'dropped features' - think syntax and function - http://dev.mysql.com/doc/refman/5.5/en/ ... shell.html
for instance this removed syntax:
- The table_type system variable (use storage_engine).
This will break code (ask Joomla)
So the answer is - you need to find out if rails is going to work without modification on MySQL 5.5.http://rubyonrails.org/
If the answer is yes, you will probably only need to manually add the folders, and likely also need the right information added to your my.ini file
This should also be relevant:http://stackoverflow.com/questions/1972 ... indows-pip
If you want, you can always DL the 1.7.3 version of XAMPP from the Source Forge Archives. It contains the mysql\lib and mysql\include folders as installed.http://sourceforge.net/projects/xampp/files/
Good Luck with your project.