diff -urN OS.orig/Makefile-FreeBSD OS/Makefile-FreeBSD
--- OS.orig/Makefile-FreeBSD	Sat Mar  5 13:25:44 2005
+++ OS/Makefile-FreeBSD	Sat Mar  5 13:26:30 2005
@@ -34,4 +34,8 @@
 EXIWHAT_MULTIKILL_ARG='^exim($$|-[0-9.]+-[0-9]+$$)'
 EXIWHAT_KILL_SIGNAL=-USR1
 
+EXPERIMENTAL_SPF=yes
+CFLAGS  += -I/usr/local/include
+LDFLAGS += -lspf2
+
 # End