Trying to build Cartopy on Windows 7 with 64 bit EPD 7.3

Trying to build Caropy on Windows 7, with 64 bit EPD 7.3:
```
c:\Users\rsignell\Documents\GitHub\cartopy>python setup.py build
running build
running build_py
running build_ext
cythoning lib/cartopy/trace.pyx to lib/cartopy\trace.cpp
Traceback (most recent call last):
  File "setup.py", line 170, in <module>
    cmdclass={'build_ext': build_ext, 'header_check': HeaderCheck},
  File "C:\python27_epd64\lib\distutils\core.py", line 152, in setup
    dist.run_commands()
  File "C:\python27_epd64\lib\distutils\dist.py", line 953, in run_commands
    self.run_command(cmd)
  File "C:\python27_epd64\lib\distutils\dist.py", line 972, in run_command
    cmd_obj.run()
  File "C:\python27_epd64\lib\distutils\command\build.py", line 127, in run
    self.run_command(cmd_name)
  File "C:\python27_epd64\lib\distutils\cmd.py", line 326, in run_command
    self.distribution.run_command(command)
  File "C:\python27_epd64\lib\distutils\dist.py", line 972, in run_command
    cmd_obj.run()
  File "C:\python27_epd64\lib\site-packages\Cython\Distutils\build_ext.py", line
 163, in run
    _build_ext.build_ext.run(self)
  File "C:\python27_epd64\lib\distutils\command\build_ext.py", line 339, in run
    self.build_extensions()
  File "C:\python27_epd64\lib\site-packages\Cython\Distutils\build_ext.py", line
 170, in build_extensions
    ext.sources = self.cython_sources(ext.sources, ext)
  File "C:\python27_epd64\lib\site-packages\Cython\Distutils\build_ext.py", line
 317, in cython_sources
    full_module_name=module_name)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Main.py", line 646,
in compile
    return compile_single(source, options, full_module_name)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Main.py", line 591,
in compile_single
    return run_pipeline(source, options, full_module_name)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Main.py", line 483,
in run_pipeline
    err, enddata = Pipeline.run_pipeline(pipeline, source)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Pipeline.py", line 3
15, in run_pipeline
    data = phase(data)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Pipeline.py", line 3
1, in parse
    check_module_name = not Options.embed)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Main.py", line 151,
in find_module
    pxd_pathname = self.find_pxd_file(module_name, pos)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Main.py", line 185,
in find_pxd_file
    pxd = self.search_include_directories(qualified_name, ".pxd", pos, sys_path=
True)
  File "C:\python27_epd64\lib\site-packages\Cython\Compiler\Main.py", line 254,
in search_include_directories
    path = os.path.join(dir, dotted_filename)
  File "C:\python27_epd64\lib\ntpath.py", line 96, in join
    assert len(path) > 0
TypeError: object of type 'NoneType' has no len()

c:\Users\rsignell\Documents\GitHub\cartopy>
```