Under Win32, libpcap is integrated in the WinPcap packet capture system. 
WinPcap provides a framework that allows libpcap to capture the packets 
under Windows 95, Windows 98, Windows ME, Windows NT 4, Windows 2000 
and Windows XP.
WinPcap binaries and source code can be found at http://winpcap.polito.it: 
they include also a developer's pack with all the necessary to compile 
libpcap-based applications under Windows.

How to compile libpcap with Visual Studio
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In order to compile libpcap you will need:

- version 6 (or higher) of Microsoft Visual Studio
- The November 2001 (or later) edition of Microsoft Platform 
Software Development Kit (SDK), that contains some necessary includes 
for IPv6 support. You can download it from http://www.microsoft.com/sdk
- the latest WinPcap sources from http://winpcap.polito.it/install 

The WinPcap source code already contains a recent (usually the latest 
stable) version of libpcap. If you need to compile a different one, 
simply download it from www.tcpdump.org and copy the sources in the 
winpcap\wpcap\libpcap folder of the WinPcap distribution. If you want to
compile a libpcap source retrieved from the tcpdump.org Git, you will 
have to create the scanner and the grammar by hand (with lex and yacc) 
or with the cygnus makefile, since The Visual Studio project is not able
to build them.

Open the project file winpcap\wpcap\prj\wpcap.dsw with Visual Studio and 
build wpcap.dll. wpcap.lib, the library file to link with the applications, 
will be generated in winpcap\wpcap\lib\. wpcap.dll will be generated in 
winpcap\wpcap\prj\release or winpcap\wpcap\prj\debug depending on the type 
of binary that is being created.

How to compile libpcap with Cygnus
----------------------------------

To build wpcap.dll, cd to the directory WPCAP/PRJ of the WinPcap source code 
distribution and type "make". libwpcap.a, the library file to link with the 
applications, will be generated in winpcap\wpcap\lib\. wpcap.dll will be 
generated in winpcap\wpcap\prj.

Remember, you CANNOT use the MSVC-generated .lib files with gcc, use 
libwpcap.a instead.

"make install" installs wpcap.dll in the Windows system folder.