--- pppd/Makefile.linux.orig	2009-07-31 00:40:29.000000000 +0200
+++ pppd/Makefile.linux	2009-07-31 00:40:30.000000000 +0200
@@ -170,8 +170,8 @@
 
 ifdef FILTER
 ifneq ($(wildcard /usr/include/pcap-bpf.h),)
-LIBS    += -lpcap
-CFLAGS  += -DPPP_FILTER
+LIBS    += -lpcap -L$(STAGING_DIR)/usr/lib
+CFLAGS  += -DPPP_FILTER -I$(STAGING_DIR)/usr/include
 endif
 endif