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mod_filter is a module for Apache 2.0 and higher, proposed for the core distribution in httpd-2.2. Its purpose is to update the filtering framework, to enable general dynamic configuration, to reduce the complexity required of content-filtering modules, and to support diagnostic and debugging in the filter chain.
On September 21st 2004 I merged the mod_filter data structs with util_filter. This serves to provide an improved API for httpd-2.1 and up. But it means that it will no longer compile with 2.0.x out-of-the box.
To compile mod_filter with httpd 2.0, you can either checkout util_filter from current CVS, or apply the minimal patch available here.
update: it appears my patch is not correct as of now. Valentine Sinitsyn has posted an updated patch. AIUI his is against current CVS. I haven't had time to check it yet. Try both patches!
mod_filter itself will run with httpd-2.0. But provider modules will have to be recompiled against the patched util-filter unless mod_filter is compiled with NO_PROTOCOL.