安装libpcap出现：
1：
libpcap. ex is a lex replacement that has many advantages, including
being able to compile libpcap.
需要更新lex
执行命令:
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1 |
sudo apt-get install flex |
2：出现错误
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1 2 3 |
yacc -d grammar.y make: yacc：命令未找到 make: *** [grammar.c] 错误 127 |
需要安装yacc
inux下是用flex和bison来分别代替lex和yacc的，安装直接使用命令：
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1 |
sudo apt-get install bison |
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