Using: Windows 7
Platform: 32/64 bit both confirmed.
Command: npm install pcap -g, npm install pcap
Other things: Tried git pull and manual compilation, to no avail!

C:\Users\jtenner\node_modules\pcap>node "C:\Program Files\nodejs\node_modules\np
m\bin\node-gyp-bin\\..\..\node_modules\node-gyp\bin\node-gyp.js" rebuild
Building the projects in this solution one at a time. To enable parallel build,
please add the "/m" switch.
  pcap_binding.cc
  pcap_session.cc
..\pcap_binding.cc(5): fatal error C1083: Cannot open include file: 'pcap/pcap.
h': No such file or directory [C:\Users\jtenner\node_modules\pcap\build\pcap_bi
nding.vcxproj]
..\pcap_session.cc(4): fatal error C1083: Cannot open include file: 'pcap/pcap.
h': No such file or directory [C:\Users\jtenner\node_modules\pcap\build\pcap_bi
nding.vcxproj]
gyp ERR! build error
gyp ERR! stack Error: `c:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe
` failed with exit code: 1
gyp ERR! stack     at ChildProcess.onExit (C:\Program Files\nodejs\node_modules\
npm\node_modules\node-gyp\lib\build.js:267:23)
gyp ERR! stack     at ChildProcess.EventEmitter.emit (events.js:98:17)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (child_process.js:789:
12)
gyp ERR! System Windows_NT 6.1.7601
gyp ERR! command "node" "C:\\Program Files\\nodejs\\node_modules\\npm\\node_modu
les\\node-gyp\\bin\\node-gyp.js" "rebuild"
gyp ERR! cwd C:\Users\jtenner\node_modules\pcap
gyp ERR! node -v v0.10.17
gyp ERR! node-gyp -v v0.10.9
gyp ERR! not ok
npm ERR! weird error 1
npm ERR! not ok code 0