title: Scapy installation fails on osx with dnet import error
body: <p>Having trouble installing Scapy and it's required dependancies. I have spent some time Googling for a solution but all 'solutions' seem to affect older versions of Python, or simply do not work.</p>
  
  <p>Script:</p>
  
  <pre><code>#!/usr/bin/python
  
  import threading
  import Queue
  import time
  from scapy.all import *
  
  class WorkerThread(threading.Thread) :
  
      def __init__(self, queue, tid) :
          threading.Thread.__init__(self)
          self.queue = queue
          self.tid = tid
          print 'Worker: %d' %self.tid
  
      def run(self) :
          total_ports = 0
          while True :
              port = 0
              try :
                  port = self.queue.get(timeout=1)
              except Queue.Empty :
                  print 'Worker %d exiting. %d ports scanned'  %(self.tid, total_ports)
  
                  return
  
                  #Scanning begins
  
              ip = sys.argv[1]
              response = sr1(IP(dst=ip)/TCP(dport=port, flags='S'), verbose=False, timeout=.2)
  
  
              if response :
                  if response[TCP].flags == 18 :
  
                      print 'ThreadID: %d: Got port no. %d status: OPEN' %(self.tid, port)
                  self.queue.task_done()
                  total_ports += 1
  
  queue = Queue.Queue()
  
  threads = []
  for i in range(1, 10) :
      print 'Creating WorkerThread : %d' %i
      worker = WorkerThread(queue, i)
      worker.setDaemon(True)
      worker.start()
      threads.append(worker)
      print 'WorkerThread %d created' %i
  
  for j in range(1, 100) :
      queue.put(j)
  
  queue.join()
  
  for item in threads :
      item.join()
  
  print 'Scanning complete'
  </code></pre>
  
  <p>Python version is 2.7.5 and path to Python verified.</p>
  
  <pre><code>which python
  /usr/bin/python
  </code></pre>
  
  <p>When script is executed I am getting the following error:</p>
  
  <pre><code>./multi-threaded-scanner.py
  Traceback (most recent call last):
    File "./multi-threaded-scanner.py", line 6, in &lt;module&gt;
      from scapy.all import *
    File "/Library/Python/2.7/site-packages/scapy/all.py", line 16, in &lt;module&gt;
      from arch import *
    File "/Library/Python/2.7/site-packages/scapy/arch/__init__.py", line 75, in &lt;module&gt;
      from bsd import *
    File "/Library/Python/2.7/site-packages/scapy/arch/bsd.py", line 12, in &lt;module&gt;
      from unix import *
    File "/Library/Python/2.7/site-packages/scapy/arch/unix.py", line 20, in &lt;module&gt;
      from pcapdnet import *
    File "/Library/Python/2.7/site-packages/scapy/arch/pcapdnet.py", line 160, in &lt;module&gt;
      import dnet
  ImportError: No module named dnet
  </code></pre>
  
  <p>I can use both the Scapy and Python interactive interpreters and running <code>import scapy</code> in the Python interpreter produces no errors.
  When the script was run initially the <code>pcapy</code> module was missing, however I installed that
  and then the issue switched to dnet, which I cannot find a solution for.
  <a href="https://stackoverflow.com/questions/2430573/scapy-install-issues-nothing-seems-to-actually-be-installed">A similar post</a>, seems to describe the same issue but the workarounds have no effect.
  Can anybody shed any more light on this issue?</p>
  
  <p>Commands used to install pcapy and libdnet:</p>
  
  <p>libdnet-1.11.tar.gz (01-19-2005)</p>
  
  <pre><code>` ~/Downloads/libdnet-1.11    
  chmod a+x configure
   ~/Downloads/libdnet-1.11    
  ./configure  &amp;&amp; make`
  </code></pre>
  
  <p>Exits successfully</p>
  
  <p>Pcapy: Latest stable release (0.10.8), updated August 26, 2010</p>
  
  <p><code>~/Downloads/pcapy-0.10.8  <br>
  sudo python setup.py install
  Password:
  running install
  running build
  running build_ext
  running build_scripts
  running install_lib
  running install_scripts
  changing mode of /usr/local/bin/96pings.pcap to 777
  changing mode of /usr/local/bin/pcapytests.py to 777
  running install_data
  running install_egg_info
  Removing /Library/Python/2.7/site-packages/pcapy-0.10.8-py2.7.egg-info
  Writing /Library/Python/2.7/site-packages/pcapy-0.10.8-py2.7.egg-info
   ~/Downloads/pcapy-0.10.8  </code></p>
  
  <p>Results for compiling with new flags</p>
  
  <pre><code> ~/Downloads/libdnet-1.12    
  sudo CFLAGS='-arch i386 -arch x86_64' ./configure --prefix=/usr and archargs='-arch i386 -arch x86_64' make
  configure: WARNING: you should use --build, --host, --target
  configure: WARNING: you should use --build, --host, --target
  checking for a BSD-compatible install... /usr/bin/install -c
  checking whether build environment is sane... yes
  /Users/richardcurteis/Downloads/libdnet-1.12/config/missing: Unknown `--is-lightweight' option
  Try `/Users/richardcurteis/Downloads/libdnet-1.12/config/missing --help' for more information
  configure: WARNING: 'missing' script is too old or missing
  checking for a thread-safe mkdir -p... config/install-sh -c -d
  checking for gawk... no
  checking for mawk... no
  checking for nawk... no
  checking for awk... awk
  checking whether make sets $(MAKE)... yes
  checking whether make supports nested variables... yes
  checking whether to enable maintainer-specific portions of Makefiles... no
  checking build system type... Invalid configuration `and': machine `and' not recognized
  configure: error: /bin/sh config/config.sub and failed
   ~/Downloads/libdnet-1.12   
  </code></pre>