On Fri, 6 Jan 2006, Daniel Ouellet wrote:
>>     #ifdef PFIL_HOOKS
>>     struct pfil_head if_pfil;       /* packet filtering hook for interfaces 
>> */
>>     #endif
>
> That was it! I didn't uncommented it, I simply didn't put it in, in the 
> kernel configuration.
>
> #options         PFIL_HOOKS      # pfil(9) packet filter hooks
>
> Sorry for waisting your time.

You didn't - I'd call this a bug.
For a quick workaround, apply the patch below. 8-)


  - Hubert

Index: pf.4
===================================================================
RCS file: /cvsroot/src/dist/pf/share/man/man4/pf.4,v
retrieving revision 1.3
diff -u -r1.3 pf.4
--- pf.4	1 Jul 2005 12:43:50 -0000	1.3
+++ pf.4	6 Jan 2006 20:15:43 -0000
@@ -27,13 +27,14 @@
  .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  .\" SUCH DAMAGE.
  .\"
-.Dd June 24, 2001
+.Dd January 6, 2006
  .Dt PF 4
  .Os
  .Sh NAME
  .Nm pf
  .Nd packet filter
  .Sh SYNOPSIS
+.Cd "options PFIL_HOOKS"
  .Cd "pseudo-device pf"
  .Sh DESCRIPTION
  Packet filtering takes place in the kernel.