Почему я не могу установить пакет pygraphviz в Python?

Я использовал Anaconda3 для установки пакета pygraphviz. В первый раз произошла ошибка, в которой говорилось, что требуется Microsoft Visual C ++ 14.0, поэтому я установил Visual Studio Community 2015 (на языке программирования также установлен модуль C ++). Однако появилась следующая ошибка:

  Collecting pygraphviz
Using cached pygraphviz-1.3.1.zip
Building wheels for collected packages: pygraphviz
Running setup.py bdist_wheel for pygraphviz ... error
Complete output from command C:\ProgramData\Anaconda3\python.exe -u -c "import setuptools, tokenize;__file__='C:\\Users\\zd1n14\\AppData\\Local\\Temp\\pip-build-pao661qp\\pygraphviz\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" bdist_wheel -d C:\Users\zd1n14\AppData\Local\Temp\tmp29u6yzrxpip-wheel- --python-tag cp36:
running bdist_wheel
running build
running build_py
creating build
creating build\lib.win-amd64-3.6
creating build\lib.win-amd64-3.6\pygraphviz
copying pygraphviz\agraph.py -> build\lib.win-amd64-3.6\pygraphviz
copying pygraphviz\graphviz.py -> build\lib.win-amd64-3.6\pygraphviz
copying pygraphviz\release.py -> build\lib.win-amd64-3.6\pygraphviz
copying pygraphviz\version.py -> build\lib.win-amd64-3.6\pygraphviz
copying pygraphviz\__init__.py -> build\lib.win-amd64-3.6\pygraphviz
creating build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_attributes.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_attribute_defaults.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_clear.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_drawing.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_edge_attributes.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_graph.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_html.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_layout.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_node_attributes.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_readwrite.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_string.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_subgraph.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\test_unicode.py -> build\lib.win-amd64-3.6\pygraphviz\tests
copying pygraphviz\tests\__init__.py -> build\lib.win-amd64-3.6\pygraphviz\tests
running egg_info
writing pygraphviz.egg-info\PKG-INFO
writing dependency_links to pygraphviz.egg-info\dependency_links.txt
writing top-level names to pygraphviz.egg-info\top_level.txt
warning: manifest_maker: standard file '-c' not found`

reading manifest file 'pygraphviz.egg-info\SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no previously-included files matching '*~' found anywhere in distribution
warning: no previously-included files matching '*.pyc' found anywhere in distribution
warning: no previously-included files matching '.svn' found anywhere in distribution
no previously-included directories found matching 'doc\build'
writing manifest file 'pygraphviz.egg-info\SOURCES.txt'
copying pygraphviz\graphviz.i -> build\lib.win-amd64-3.6\pygraphviz
copying pygraphviz\graphviz_wrap.c -> build\lib.win-amd64-3.6\pygraphviz
running build_ext
building 'pygraphviz._graphviz' extension
creating build\temp.win-amd64-3.6
creating build\temp.win-amd64-3.6\Release
creating build\temp.win-amd64-3.6\Release\pygraphviz
C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\BIN\x86_amd64\cl.exe /c /nologo /Ox /W3 /GL /DNDEBUG /MD -IC:\ProgramData\Anaconda3\include -IC:\ProgramData\Anaconda3\include "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\INCLUDE" "-IC:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\ATLMFC\INCLUDE" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.10586.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\NETFXSDK\4.6\include\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.10586.0\shared" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.10586.0\um" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.10586.0\winrt" /Tcpygraphviz/graphviz_wrap.c /Fobuild\temp.win-amd64-3.6\Release\pygraphviz/graphviz_wrap.obj
graphviz_wrap.c
pygraphviz/graphviz_wrap.c(2954): fatal error C1083: Cannot open include file: 'graphviz/cgraph.h': No such file or directory
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\VC\\BIN\\x86_amd64\\cl.exe' failed with exit status 2

Может кто-нибудь мне помочь? Спасибо заранее.