Require fails with my new setup

Hello!

I've installed apache and modruby again but now I'm not able to require  
ruby files from different directories than the default ones.
I've added /my/dir to $: from within my script and also with the  
RubyAddPath directive:

LoadModule ruby_module modules/mod_ruby.so
<IfModule mod_ruby.c>
   # for Apache::RubyRun
   RubyAddPath /home/dwerder/dev/rb/web
   RubyRequire apache/ruby-run
   # exec *.rbx as ruby scripts.
   <Files *.rb>
     Options +ExecCGI
     SetHandler ruby-object
     RubyHandler Apache::RubyRun.instance
   </Files>
</IfModule>

The directory is not world writeable and files are readable by everyone.
ruby says it can't find the file:
/usr/local/apache2/htdocs/test.rb:4:in `require': No such file to load --  
http (LoadError)

thanks for help!
Dominik