title: fatal error: sys/socket.h: No such file or directory, x86_64-w64-mingw32 mode
body: <p>I am trying to develop a program which depends on socket library, once i am trying to make it, it prompt me: </p>
  
  <pre><code>fatal error: sys/socket.h: No such file or directory
   #include &lt;sys/socket.h&gt;
  </code></pre>
  
  <p>My build environment:
  Windows 8.1 under Cygwin x64 version,
  Build target: x86_64-w64-mingw32 as the --host=x86_64-w64-mingw32 parameters. </p>
  
  <p>Command Line: cfalgs=-m64 ./configure --prefix=/usr/</p>
  
  <p>I am building the app which is using the GTK+ 2.0. </p>
  
  <p>I am trying to find the find under the socket.h file under the patch: cygwin64\usr\x86_64-w64-mingw32\sys-root\mingw\include\sys.  It seems not exist at all. </p>
  
  <p>So there is no x64 version MinGW socket lib??</p>