title: configure libdnet under Cygwin+MinGW
body: <p>I'm trying to use scapy on win python2.7.
  When I configure libdnet under Cygwin+MinGW,there is a problem that checking for Python... configure: error: need MingW32 package to build under Cygwin.
  Can some help me in this ?</p>
  
  <p>PS:
  i have worked out my problem just now,but i have a new problem.After running setup.py,it warns me that ../include\dnet/os.h(26) : error C2371: "ssize_t": ???;??????</p>