Mac OSX Problem: Cannot Load mod_ruby.so - Undefined symbols

hi,

I try to work with mod_ruby under mac osx but everytime i start my apache
the following error occured:

--------------------------------------------------------------------------
Syntax error on line 1102 of /Library/Apache2/conf/httpd.conf:
Cannot load /usr/libexec/httpd/mod_ruby.so into server: dyld:
/Library/Apache2/bin/httpd Undefined symbols:
_ap_null_cleanup
--------------------------------------------------------------------------

this is Line 1102 in my httpd.conf:
--------------------------------------------------------------------------
LoadModule ruby_module /usr/libexec/httpd/mod_ruby.so
--------------------------------------------------------------------------

this is the other mod_ruby config stuff in my httpd.conf:
--------------------------------------------------------------------------
RubyRequire apache/ruby-run
<FilesMatch ".rbx">
 Options +ExecCGI
 SetHandler ruby-object
 RubyHandler Apache::RubyRun.instance
</FilesMatch>

RubyRequire apache/eruby-run
<FilesMatch ".rhtml">
 SetHandler ruby-object
 RubyHandler Apache::ERubyRun.instance
</FilesMatch>
--------------------------------------------------------------------------

I use:
mod_ruby from cvs..
Mac osx 10.3
Apache 2.0.48
Ruby 1.8.1

Any ideas?


bovi