title: Installing PyGraphViz on Windows, Python 2.7
body: <p>I can't install pygraphviz on Windows XP. I'm using Python27.</p>
  
  <p>Before to launch the setup I've changet these two variables of the setup.py file</p>
  
  <pre><code>library_path="C:\\Archivos de programa\\Graphviz 2.28\\bin"
  include_path="C:\\Archivos de programa\\Graphviz 2.28\\include\\graphviz"
  </code></pre>
  
  <p>Then I've launched the setup. I'm using mingw32 as a compiler. I don't know what can I do now. I'm using the following command:</p>
  
  <pre><code>C:\Python27\pygraphviz-1.1&gt;c:\python27\python setup.py build -c mingw32
  </code></pre>
  
  <p>And I've got the folling result</p>
  
  <pre><code>library_path=C:\Archivos de programa\Graphviz 2.28\bin
  include_path=C:\Archivos de programa\Graphviz 2.28\include\graphviz
  running build
  running build_py
  running build_ext
  building 'pygraphviz._graphviz' extension
  C:\MinGW\bin\gcc.exe -mno-cygwin -mdll -O -Wall "-IC:\Archivos de programa\Graphviz 2.28\include\graphviz" -Ic:\python27\include -Ic:\python
  27\PC -c pygraphviz/graphviz_wrap.c -o build\temp.win32-2.7\Release\pygraphviz\graphviz_wrap.o
  pygraphviz/graphviz_wrap.c: In function 'agattr_label':
  pygraphviz/graphviz_wrap.c:2855:5: warning: return makes integer from pointer without a cast
  writing build\temp.win32-2.7\Release\pygraphviz\_graphviz.def
  Traceback (most recent call last):
    File "setup.py", line 146, in &lt;module&gt;
      package_data     = package_data
    File "c:\python27\lib\distutils\core.py", line 152, in setup
      dist.run_commands()
    File "c:\python27\lib\distutils\dist.py", line 953, in run_commands
      self.run_command(cmd)
    File "c:\python27\lib\distutils\dist.py", line 972, in run_command
      cmd_obj.run()
    File "c:\python27\lib\distutils\command\build.py", line 127, in run
      self.run_command(cmd_name)
    File "c:\python27\lib\distutils\cmd.py", line 326, in run_command
      self.distribution.run_command(command)
    File "c:\python27\lib\distutils\dist.py", line 972, in run_command
      cmd_obj.run()
    File "c:\python27\lib\distutils\command\build_ext.py", line 340, in run
      self.build_extensions()
    File "c:\python27\lib\distutils\command\build_ext.py", line 449, in build_extensions
      self.build_extension(ext)
    File "c:\python27\lib\distutils\command\build_ext.py", line 531, in build_extension
      target_lang=language)
    File "c:\python27\lib\distutils\ccompiler.py", line 741, in link_shared_object
      extra_preargs, extra_postargs, build_temp, target_lang)
    File "c:\python27\lib\distutils\cygwinccompiler.py", line 260, in link
      target_lang)
    File "c:\python27\lib\distutils\unixccompiler.py", line 218, in link
      libraries)
    File "c:\python27\lib\distutils\ccompiler.py", line 1121, in gen_lib_options
      opt = compiler.runtime_library_dir_option(dir)
    File "c:\python27\lib\distutils\unixccompiler.py", line 285, in runtime_library_dir_option
      compiler = os.path.basename(sysconfig.get_config_var("CC"))
    File "c:\python27\lib\ntpath.py", line 198, in basename
      return split(p)[1]
    File "c:\python27\lib\ntpath.py", line 170, in split
      d, p = splitdrive(p)
    File "c:\python27\lib\ntpath.py", line 125, in splitdrive
      if p[1:2] == ':':
  TypeError: 'NoneType' object is not subscriptable
  </code></pre>
  
  <p>Any idea on how to solve it over windows?</p>
  
  <p>In other computer with Ubuntu I've installed without problems.  </p>