In FreeBSD we always have bpf(4) API, either real or stub. No need

in detecting presense of 'device bpf'.

sys/contrib/pf/net/if_pfsync.c

@@ -45,17 +45,12 @@
 #ifdef __FreeBSD__
 #include "opt_inet.h"
 #include "opt_inet6.h"
-#include "opt_bpf.h"
 #include "opt_pf.h"
 
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#ifdef DEV_BPF
-#define	NBPFILTER	DEV_BPF
-#else
-#define	NBPFILTER	0
-#endif
+#define	NBPFILTER	1
 
 #ifdef DEV_PFSYNC
 #define	NPFSYNC		DEV_PFSYNC

sys/modules/pfsync/Makefile

@@ -6,7 +6,7 @@
 
 KMOD=	pfsync
 SRCS=	if_pfsync.c \
-	opt_pf.h opt_inet.h opt_inet6.h opt_bpf.h
+	opt_pf.h opt_inet.h opt_inet6.h
 
 CFLAGS+= -I${.CURDIR}/../../contrib/pf
 SRCS+=	bus_if.h device_if.h
@@ -24,9 +24,6 @@ opt_inet6.h:
 	echo "#define INET6 1" > ${.TARGET}
 .endif
 
-opt_bpf.h:
-	echo "#define DEV_BPF 1" > ${.TARGET}
-
 .if defined(VIMAGE)
 opt_global.h:
 	echo "#define VIMAGE 1" >> ${.TARGET}