CentOS安裝libpcap

  1.安裝GCC：   yum -y install gcc-c++c++ 2.安裝flex：   yum -y install flex   沒有flex，直接安裝libpcap會提示"Your operating system's lex is insufficient to compile libpcap"錯誤； tcp 3.安裝bison   yum -y install bison  

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