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1. 交叉编译
编译tcpdump需要提前下载libpcap，这两个库都可以在tcpdump官网上进行下载，链接如下：
http://www.tcpdump.org/#mailing-lists
1.1 编译libpcap
交叉编译libpcap，libpcap支持CMake，既可以使用configure进行编译，也可以使用cmake
cmake .. -DCMAKE_TOOLCHAIN_FILE=XXXX.cmake -DCMAKE_INSTALL_PREFIX=XXXX
或者
./configure --host=arm-himix200-linux ac_cv_linux_vers=2 CC=arm-himix200-linux-gcc
(如果需要安装可以添加上--prefix= XXXX)
1.2 编译tcpdump
交叉编译tcpdump，如INSTALL.txt中所说：
After libpcap has been built (either install it with "make install" or
make sure both the libpcap and tcpdump source trees are in the same
directory), run ./configure (a shell script). "configure" will
determine your system attributes and generate an appropriate Makefile
from Makefile.in. Now build tcpdump by running "make".
tcpdump需要依赖libpcap，有两种方式满足依赖：（1）libpcap和tcpdump代码在同一级目录下 （2）指定libpcap的路径
/configure --host=arm-himix200-linux ac_cv_linux_vers=2 --with-system-libpcap=XXXX/libpcap/lib
此外，github上下载的最新版tcpdump也支持CMake，编译命令如下：
cmake .. -DCMAKE_TOOLCHAIN_FILE=XXXX/arm-himix200-linux.cmake -DPCAP_INCLUDE_DIR=XXXX/prefix/libpcap/include -DPCAP_LIBRARY=XXXX/prefix/libpcap/lib | 
转播
