--- /dev/null
+#
+# Copyright (c) 2001, 2002 Swedish Institute of Computer Science.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification,
+# are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+# 3. The name of the author may not be used to endorse or promote products
+# derived from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+# WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+# SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+# IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+# OF SUCH DAMAGE.
+#
+# This file is part of the lwIP TCP/IP stack.
+#
+# Author: Adam Dunkels <adam@sics.se>
+#
+
+## modified by Lei Xia
+
+PROJECT_ROOT=../../../
+
+#Set this to where you have the lwip core module
+LWIPDIR=..
+
+CC_PREFIX := $(PROJECT_ROOT)../devtools/i386/bin/i386-elf-
+CC=$(CC_PREFIX)gcc
+CFLAGS=-g -Wall -fpic -DIPv4 -DLWIP_DEBUG
+ARCHIVE=ar
+
+CFLAGS:=$(CFLAGS) \
+ -I$(PROJECT_ROOT)include/ -I$(PROJECT_ROOT)include/lwip -I$(PROJECT_ROOT)include/lwip/ipv4 -I$(PROJECT_ROOT)include/libc
+
+# COREFILES, CORE4FILES: The minimum set of files needed for lwIP.
+COREFILES=$(LWIPDIR)/core/mem.c $(LWIPDIR)/core/memp.c $(LWIPDIR)/core/netif.c \
+ $(LWIPDIR)/core/pbuf.c $(LWIPDIR)/core/stats.c $(LWIPDIR)/core/sys.c \
+ $(LWIPDIR)/core/tcp.c $(LWIPDIR)/core/tcp_in.c $(LWIPDIR)/core/raw.c\
+ $(LWIPDIR)/core/tcp_out.c $(LWIPDIR)/core/udp.c $(LWIPDIR)/core/init.c
+CORE4FILES=$(LWIPDIR)/core/ipv4/icmp.c $(LWIPDIR)/core/ipv4/ip.c \
+ $(LWIPDIR)/core/ipv4/inet.c $(LWIPDIR)/core/ipv4/ip_addr.c \
+ $(LWIPDIR)/core/ipv4/inet_chksum.c $(LWIPDIR)/core/ipv4/ip_frag.c
+
+
+# APIFILES: The files which implement the sequential and socket APIs.
+APIFILES=$(LWIPDIR)/api/api_lib.c $(LWIPDIR)/api/api_msg.c $(LWIPDIR)/api/tcpip.c \
+ $(LWIPDIR)/api/err.c $(LWIPDIR)/api/sockets.c $(LWIPDIR)/api/netbuf.c $(LWIPDIR)/api/netdb.c $(LWIPDIR)/api/netifapi.c
+
+# NETIFFILES: Files implementing various generic network interface functions.'
+NETIFFILES=$(LWIPDIR)/netif/loopif.c $(LWIPDIR)/netif/ne2kif.c $(LWIPDIR)/netif/etharp.c
+
+# ARCHFILES: Architecture specific files.
+ARCHFILES=$(LWIPDIR)/arch/sys_arch.c
+
+# APPFILES: Application files
+APPFILES=$(LWIPDIR)/apps/ping.c
+
+# LWIPFILES: All the above.
+LWIPFILES=$(COREFILES) $(CORE4FILES) $(APIFILES) $(NETIFFILES) $(ARCHFILES) $(APPFILES)
+LWIPFILESW=$(wildcard $(LWIPFILES))
+LWIPOBJS=$(notdir $(LWIPFILESW:.c=.o))
+
+# LWIPLIB=lwip.o
+
+%.o:
+ $(CC) $(CFLAGS) -c $(LWIPFILES)
+
+all: $(LWIPOBJS)
+ cp *.o $(PROJECT_ROOT)build/lwip/
+
+.PHONY: all
+
+clean:
+ rm -f *.o .depend*
+
+depend dep: .depend
+
+include .depend
+
+# $(LWIPLIB): $(LWIPOBJS)
+# $(CC) -g -nostartfiles -shared -static $^ -o $@
+
+.depend: $(LWIPFILES)
+ $(CC) $(CFLAGS) -MM $^ > .depend || rm -f .depend