`pip install pygraphviz` fails to find graphviz

When installing pygraphviz (1.3.1), I got an error that library_dirs and ʻinclude_dirs` were not found.

environment

• Debian jessie (on VirtualBox)
• Python 3.5.1

Solution

I didn't install graphviz, so I installed it.

sudo aptitude install graphviz graphviz-dev

-> I also added dev, but this alone didn't solve the problem.

I found the library path can be found by uncommenting setup.py Error in installing pygraphviz --Miscellaneous notes.

So, read setup.py and sudo aptitude install pkg-config It worked. It's annoying to mess with setup.py even though I installed it with pip.

Reference: Error message

vagrant@debian-jessie:~/$ pip install pygraphviz
Collecting pygraphviz
  Using cached pygraphviz-1.3.1.tar.gz
Installing collected packages: pygraphviz
  Running setup.py install for pygraphviz ... error
    Complete output from command /home/vagrant/.pyenv/versions/3.5.1/envs/sitegraph/bin/python3.5 -u -c "
import setuptools, tokenize;__file__='/tmp/pip-build-g95csk3x/pygraphviz/setup.py';exec(compile(getattr(t
okenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/
pip-5vp5ruci-record/install-record.txt --single-version-externally-managed --compile --install-headers /h
ome/vagrant/.pyenv/versions/3.5.1/envs/sitegraph/include/site/python3.5/pygraphviz:
    running install
    Trying pkg-config
    Failed to find pkg-config
    Trying dotneato-config
    Failed to find dotneato-config
    Failed to find dotneato-config

    Your Graphviz installation could not be found.

            1) You don't have Graphviz installed:
               Install Graphviz (http://graphviz.org)

            2) Your Graphviz package might incomplete.
               Install the binary development subpackage (e.g. libgraphviz-dev or similar.)

            3) You are using Windows
               There are no PyGraphviz binary packages for Windows but you might be
               able to build it from this source.  See
               http://networkx.lanl.gov/pygraphviz/reference/faq.html

            If you think your installation is correct you will need to manually
            change the include_dirs and library_dirs variables in setup.py to
            point to the correct locations of your graphviz installation.

            The current setting of library_dirs and include_dirs is:
    library_dirs=None
    include_dirs=None

    error: Error locating graphviz.

    ----------------------------------------
Command "/home/vagrant/.pyenv/versions/3.5.1/envs/sitegraph/bin/python3.5 -u -c "import setuptools, toke$
ize;__file__='/tmp/pip-build-g95csk3x/pygraphviz/setup.py';exec(compile(getattr(tokenize, 'open', open)($
_file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-5vp5ruci-record/inst
all-record.txt --single-version-externally-managed --compile --install-headers /home/vagrant/.pyenv/versi
ons/3.5.1/envs/sitegraph/include/site/python3.5/pygraphviz" failed with error code 1 in /tmp/pip-build-g9
5csk3x/pygraphviz