我正在尝试使用pip安装pygraphviz，但出现此错误：
j > i请帮助，我确实安装了graphviz：
Collecting pygraphviz
Using cached https://files.pythonhosted.org/packages/7e/b1/d6d849ddaf6f11036f9980d433f383d4c13d1ebcfc3cd09bc845bda7e433/pygraphviz-1.5.zip
Installing collected packages: pygraphviz
Running setup.py install for pygraphviz
Package libcgraph was not found in the pkg-config search path.
Perhaps you should add the directory containing `libcgraph.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libcgraph' found
Trying dpkg
Failed to find dpkg
Trying pkg-config
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/private/var/folders/43/m1qv9zf53q19sqh6h9kg9pz80000gn/T/pip-build-2nqbhW/pygraphviz/setup.py", line 93, in <module>
tests_require=['nose>=1.3.7', 'doctest-ignore-unicode>=0.1.2', 'mock>=2.0.0'],
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 151, in setup
dist.run_commands()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File "setup_commands.py", line 44, in modified_run
self.include_path, self.library_path = get_graphviz_dirs()
File "setup_extra.py", line 162, in get_graphviz_dirs
include_dirs, library_dirs = _try_configure(include_dirs, library_dirs, _pkg_config)
File "setup_extra.py", line 117, in _try_configure
i, l = try_function()
File "setup_extra.py", line 72, in _pkg_config
output = S.check_output(['pkg-config', '--libs-only-L', 'libcgraph'])
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 573, in check_output
raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['pkg-config', '--libs-only-L', 'libcgraph']' returned non-zero exit status 1
Complete output from command /Users/ciasto/virtualPyEnvs/netgraph/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/43/m1qv9zf53q19sqh6h9kg9pz80000gn/T/pip-build-2nqbhW/pygraphviz/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/43/m1qv9zf53q19sqh6h9kg9pz80000gn/T/pip-D9iNeZ-record/install-record.txt --single-version-externally-managed --compile --install-headers /Users/ciasto/virtualPyEnvs/netgraph/include/site/python2.7:
running install
Package libcgraph was not found in the pkg-config search path.
Perhaps you should add the directory containing `libcgraph.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libcgraph' found
Trying dpkg
Failed to find dpkg
Trying pkg-config
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/private/var/folders/43/m1qv9zf53q19sqh6h9kg9pz80000gn/T/pip-build-2nqbhW/pygraphviz/setup.py", line 93, in <module>
tests_require=['nose>=1.3.7', 'doctest-ignore-unicode>=0.1.2', 'mock>=2.0.0'],
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 151, in setup
dist.run_commands()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 953, in run_commands
self.run_command(cmd)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/dist.py", line 972, in run_command
cmd_obj.run()
File "setup_commands.py", line 44, in modified_run
self.include_path, self.library_path = get_graphviz_dirs()
File "setup_extra.py", line 162, in get_graphviz_dirs
include_dirs, library_dirs = _try_configure(include_dirs, library_dirs, _pkg_config)
File "setup_extra.py", line 117, in _try_configure
i, l = try_function()
File "setup_extra.py", line 72, in _pkg_config
output = S.check_output(['pkg-config', '--libs-only-L', 'libcgraph'])
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 573, in check_output
raise CalledProcessError(retcode, cmd, output=output)
subprocess.CalledProcessError: Command '['pkg-config', '--libs-only-L', 'libcgraph']' returned non-zero exit status 1
----------------------------------------
Command "/Users/ciasto/virtualPyEnvs/netgraph/bin/python -c "import setuptools, tokenize;__file__='/private/var/folders/43/m1qv9zf53q19sqh6h9kg9pz80000gn/T/pip-build-2nqbhW/pygraphviz/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/43/m1qv9zf53q19sqh6h9kg9pz80000gn/T/pip-D9iNeZ-record/install-record.txt --single-version-externally-managed --compile --install-headers /Users/ciasto/virtualPyEnvs/netgraph/include/site/python2.7" failed with error code 1 in /private/var/folders/43/m1qv9zf53q19sqh6h9kg9pz80000gn/T/pip-build-2nqbhW/pygraphviz