<IfDefine HTTPBL>
LoadModule httpbl_module modules/mod_httpbl.so
HTTPBLRBLEnabled On
HTTPBLLogDir /var/log/apache2/httpbl
HTTPBLReposDir /var/cache/mod_httpbl
HTTPBLAccessKey # You should set yours here
<Location /httpbl_diagnostics>
Order deny,allow
Deny from all
</Location>
</IfDefine>