Description of problem:
Filters are not being read because run-parts is being used on the directories. I guess Debian has a --list option to run-parts but RedHat does not.

Version-Release number of selected component (if applicable):
logcheck-1.3.13-3.el5

How reproducible:
All the time

Steps to Reproduce:
1.Install logwatch
2.Run logwatch
3.Notice that nothing is filtered out
  
Actual results:
Nothing is filtered out

Expected results:
Filters should be applied

Additional info:
I fixed it by changing run-parts to ls

218c218
<       for rulefile in $(ls "$dir"); do
---
>       for rulefile in $(run-parts "$dir"); do