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The latest subprocess32, 3.2.6, is unable to be installed in Windows 7 via pip. 
The error messages:
_posixsubprocess.c(10) : fatal error C1083: Cannot open include file: 'unistd.h': No such file or directory
error: command 'C:\\Users\\user1\\AppData\\Local\\Programs\\Common\\Microsoft\\Visual C++ for Python\9円.0\\VC\\Bin\\cl.exe' failed with exit status 2
Read that unistd.h is not a Windows file.

subprocess32 is not part of Python, it's a third party mode. Report the issue to his author.

Quoting from https://code.google.com/p/python-subprocess32/:
"Think you've found an issue? Please try to reproduce it using Python 3.4 and file it using http://bugs.python.org/. Work will be done upstream and backported to this project."

Here is a patch.

_posixsubprocess should not be compiled on Windows, as it will not work and
has the potential to completely screw up subprocess on Windows. This
appears to be a bug in subprocess32's setup.py, and thus does not apply to
Python itself at all. I agree with Victor that this bug doesn't belong
here.

Oh, good point! I missed that, thanks.

HI!
need that thingie too, did you poke the author?
cant find issue tracker at code.google.com

I can apply this to subprocess32 but it is going to look much more like:
+#ifndef MS_WINDOWS /* WTF is anyone compiling on Windows? Shouldn't work! */
+# define HAVE_UNISTD_H 1
+#endif
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
The real question is why do you need it?
_posixsubprocess.c makes no sense to compile on Windows as far as I understand it. subprocess32 in its entirety makes no sense to use on Windows as nobody is testing, maintaining or updating the Windows side of its code.
The module backport was created for reliable use on POSIX platforms where the existing python 2.x subprocess module falls short.
I recommend:
try:
 import subprocess32 as subprocess
except ImportError:
 import subprocess
OR
if sys.platform.startswith('win'):
 import subprocess
else:
 import subprocess32 as subprocess
in cross platform code that needs to run on Windows.
....
BTW, anyone know what update do I need to make to setup.py and its PIP categorization to mark it as unavailable on Windows?