I also had to fix the Linux/Makefile. For some reason it tried to install ipfilter.o as ipfilter.ko. I don't think this will work on any Linux platform.
Apply the attached patch to fix this problem.
Sincerely,
Richard van den Berg
--- ip_fil4.1.5/Linux/Makefile 2004-11-08 19:42:44.000000000 +0100 +++ ip_fil4.1.5_ok/Linux/Makefile 2005-01-12 14:44:43.000000000 +0100 @@ -479,7 +479,7 @@ done $(CP) $(TOP)/ipl.h $(ROOTDIR)/usr/include/netinet/ipl.h -if [ -d $(IPV4DIR) ] ; then \ - cp $(CPUDIR)/ipfilter.o $(ROOTDIR)$(IPV4DIR)/ipfilter.$(MODEXT); \ + cp $(CPUDIR)/ipfilter.$(MODEXT) $(ROOTDIR)$(IPV4DIR)/ipfilter.$(MODEXT); \ fi (for i in ipfstat ipf ipnat ippool ipfs; do \ (cd $(CPUDIR); ../$(INSTALL) -c -s -g wheel -m 755 -o root $$i $(ROOTDIR)$(SBINDEST)); \
