It was a struggle, but we got there in the end. The background to this was that I tried to upgrade my Rails install from 2.3.3 to 2.3.5 using the Rails wiki Getting Started guide, and then started running into problems. Ooh look, here it is:
Library/Ruby/Site/1.8/rubygems.rb:777:in `report_activate_error’: RubyGem version error: rack(1.0.0 not ~> 1.0.1) (Gem::LoadError)
…which [...]
Archive : mysql
2nd March 2010
26th February 2010
I kept getting a segmentation fault from abstract_adapter.rb when trying to connect to my controller – some people have reported success rolling back to MySQL 5.0, but if you want to use 5.1, try using the libmysql.dll from InstantRails:
http://instantrails.rubyforge.org/svn/trunk/InstantRails-win/InstantRails/mysql/bin/libmySQL.dll
(via peterskim.org)