Trouble with Imagemagick and Rails 2.3.5

After upgrading to Rails 2.3.5 I got a runtime error message from a
previously running well application (w Passenger)
dont’ see where to start looking for a solution… help
appreciated ;-))

error message from Passenger
This installation of RMagick was configured with ImageMagick 6.5.8 but
ImageMagick 6.4.8-7 is in use.

backtrace
0 /usr/local/lib/ruby/gems/1.8/gems/rmagick-2.12.2/lib/
RMagick2.bundle
1 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31
in require' 2 /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/ active_support/dependencies.rb 158 inrequire’
3 /usr/local/lib/ruby/gems/1.8/gems/rmagick-2.12.2/lib/RMagick.rb 11
4 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 36
in gem_original_require' 5 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 36 inrequire’
6 /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/
active_support/dependencies.rb 158 in require' 7 /Users/yves/Developpement/Projects/isabelle/atelier/app/controllers/ aquarelles_controller.rb 1 8 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31 ingem_original_require’
9 /usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb 31
in require' 10 /usr/local/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/ active_support/dependencies.rb 158 inrequire’

from install log

—> Installing ImageMagick @6.5.8-0_1+q16
—> Activating ImageMagick @6.5.8-0_1+q16

Successfully installed rmagick-2.12.2…

where could be located ImageMagick 6.4.8-7 if it’s in use ?

thanks fyh

erwin