windows 下安装python 的pygraphviz包方法

最开始，我通过pip install pygraphviz

出现以下问题：

Collecting pygraphviz
  Using cached pygraphviz-1.3.1.tar.gz
Building wheels for collected packages: pygraphviz
  Running setup.py bdist_wheel for pygraphviz
  Complete output from command C:\Python27\python.exe -c "import setuptools;__fi
le__='c:\\users\\luofuli\\appdata\\local\\temp\\7\\pip-build-vbneip\\pygraphviz\
\setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, '
exec'))" bdist_wheel -d c:\users\luofuli\appdata\local\temp\7\tmp5xiixqpip-wheel
-:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build\lib.win-amd64-2.7
  creating build\lib.win-amd64-2.7\pygraphviz
  copying pygraphviz\agraph.py -> build\lib.win-amd64-2.7\pygraphviz
  copying pygraphviz\graphviz.py -> build\lib.win-amd64-2.7\pygraphviz
  copying pygraphviz\release.py -> build\lib.win-amd64-2.7\pygraphviz
  copying pygraphviz\version.py -> build\lib.win-amd64-2.7\pygraphviz
  copying pygraphviz\__init__.py -> build\lib.win-amd64-2.7\pygraphviz
  creating build\lib.win-amd64-2.7\pygraphviz\tests
  copying pygraphviz\tests\test.py -> build\lib.win-amd64-2.7\pygraphviz\tests
  copying pygraphviz\tests\test_attributes.py -> build\lib.win-amd64-2.7\pygraph
viz\tests
  copying pygraphviz\tests\test_attribute_defaults.py -> build\lib.win-amd64-2.7
\pygraphviz\tests
  copying pygraphviz\tests\test_clear.py -> build\lib.win-amd64-2.7\pygraphviz\t
ests
  copying pygraphviz\tests\test_drawing.py -> build\lib.win-amd64-2.7\pygraphviz
\tests
  copying pygraphviz\tests\test_edge_attributes.py -> build\lib.win-amd64-2.7\py
graphviz\tests
  copying pygraphviz\tests\test_graph.py -> build\lib.win-amd64-2.7\pygraphviz\t
ests
  copying pygraphviz\tests\test_html.py -> build\lib.win-amd64-2.7\pygraphviz\te
sts
  copying pygraphviz\tests\test_layout.py -> build\lib.win-amd64-2.7\pygraphviz\
tests
  copying pygraphviz\tests\test_node_attributes.py -> build\lib.win-amd64-2.7\py
graphviz\tests
  copying pygraphviz\tests\test_readwrite.py -> build\lib.win-amd64-2.7\pygraphv
iz\tests
  copying pygraphviz\tests\test_string.py -> build\lib.win-amd64-2.7\pygraphviz\
tests
  copying pygraphviz\tests\test_subgraph.py -> build\lib.win-amd64-2.7\pygraphvi
z\tests
  copying pygraphviz\tests\test_unicode.py -> build\li