Add option to compile with locally compile libbpf

packet-exchange/build/Makefile

@@ -27,10 +27,12 @@ CFLAGS += -std=gnu99
 
 LDFLAGS = -pthread
 
-ifeq ($(WITH_XDP),)
-else
+ifneq ($(WITH_XDP),)
 CFLAGS += -D WITH_XDP
 LDFLAGS += -L/usr/lib -lbpf
+else ifneq ($(WITH_GIT_XDP),)
+CFLAGS += -D WITH_XDP -I$${HOME}/libbpf/src
+LDFLAGS += -L$${HOME}/libbpf/src -lbpf
 endif
 
 vpath %.c $(SRCDIR)