Metasploit此乃渗透工程师必备神器，在Centos 7下安装Metaspoit软件，需要安装很多Ruby的Bundle，其中一个就是Pcaprub，在运行安装命令：gem install -v=0.12.0 pcaprub，出现以下错误提示：ERROR: Error installing pcaprub:
ERROR: Failed to build gem native extension.
解决办法如下：
1.使用yum安装libpcap
[ocean@localhost include]$ yum list libcap
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirror.netaddicted.ca
* elrepo: reflector.westga.edu
* epel: mirror.steadfast.net
* extras: mirror.netaddicted.ca
* linuxtech-release: pkgrepo.linuxtech.net
* nux-dextop: mirror.li.nux.ro
* updates: mirror.netaddicted.ca
已安装的软件包
libcap.x86_64 2.22-8.el7 @anaconda
可安装的软件包
libcap.i686 2.22-8.el7 C7.0.1406-base
2.安装nmap工具
cd /usr/src
svn co https://svn.nmap.org/nmap
cd nmap
./configure
make
make install
make clean
3.拷贝pcap目录和pcap.h到/usr/local/include目录
cp /usr/src/nmap/libpcap/pcap.h /usr/local/include
cp -r /usr/src/nmap/libpcap/pcap /usr/local/include
4.重新运行安装命令：gem install -v=0.12.0 pcaprub
问题解决。
[ocean@localhost config]$ gem install -v=0.12.0 pcaprub
Building native extensions. This could take a while...
Successfully installed pcaprub-0.12.0
Parsing documentation for pcaprub-0.12.0
Done installing documentation for pcaprub after 0 seconds
1 gem installed