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<title>Jeff T.'s FAQ: No /usr/include/net/bpf.h header in Linux</title>
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<h1>No /usr/include/net/bpf.h header in Linux</h1>
<h3>Setup</h3>
<p>I am on a Gentoo Linux machine running a 2.6.10 kernel. I believe I ran into this problem while trying to compile <code><a href="http://www.tcpdump.org/related.html">tcpslice</a></code>. However, I gather from googling that many other Linux distributions and network-related tools (such as <code><a href="http://www.ethereal.com/">ethereal</a></code>) are affected.</p>
<h3>Symptoms</h3>
<p>I forget the exact error message given by gcc since this happened a couple of days ago, but I do know that it failed on a <code>#include <net/bpf.h></code> line because it couldn't find the header file.</p>
<h3>Background</h3>
<p>BPF stands for Berkeley Packet Filter, and I believe this is something that is supported on BSD systems. Linux does not support BPF by default. However, <code><a href="http://www.tcpdump.org/">libpcap</a></code> provides a compatible header.</p>
<h3>Resolution</h3>
<p>Install libpcap, using whatever means necessary. Then simply:</p>
<p><code>cp /usr/include/pcap-bpf.h /usr/include/net/bpf.h</code></p>
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