error related to install pycairo

[amiltonwong]

Hi, @gordicaleksa,

Thanks for providing such great tutorial. I came across pycairo error when building the virtual env based on the provided environment.yml. The error is as follows:

Pip subprocess error:
  ERROR: Command errored out with exit status 1:
   command: /root/anaconda3/envs/pytorch-gat/bin/python /root/anaconda3/envs/pytorch-gat/lib/python3.8/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /tmp/tmp1xff5oe8
       cwd: /tmp/pip-install-kkpb3rbl/pycairo_24f3dd5c18ec42d9854417db277fda61
  Complete output (15 lines):
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib.linux-x86_64-3.8
  creating build/lib.linux-x86_64-3.8/cairo
  copying cairo/__init__.py -> build/lib.linux-x86_64-3.8/cairo
  copying cairo/__init__.pyi -> build/lib.linux-x86_64-3.8/cairo
  copying cairo/py.typed -> build/lib.linux-x86_64-3.8/cairo
  running build_ext
  Package cairo was not found in the pkg-config search path.
  Perhaps you should add the directory containing `cairo.pc'
  to the PKG_CONFIG_PATH environment variable
  No package 'cairo' found
  Command '['pkg-config', '--print-errors', '--exists', 'cairo >= 1.15.10']' returned non-zero exit status 1.
  ----------------------------------------
  ERROR: Failed building wheel for pycairo
ERROR: Could not build wheels for pycairo which use PEP 517 and cannot be installed directly

Any hints to solve this issue?

(My system is ubuntu 16.04)

Thanks!

[amiltonwong]

Supplement:

Even though I install pycairo under google colab environment, I still cannot install it properly
!pip install pycairo==1.20.0

Collecting pycairo==1.20.0
  Downloading https://files.pythonhosted.org/packages/9d/6e/499d6a6db416eb3cdf0e57762a269908e4ab6638a75a90972afc34885b91/pycairo-1.20.0.tar.gz (344kB)
     |████████████████████████████████| 348kB 15.3MB/s 
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Building wheels for collected packages: pycairo
  Building wheel for pycairo (PEP 517) ... error
  ERROR: Failed building wheel for pycairo
  Running setup.py clean for pycairo
Failed to build pycairo
ERROR: Could not build wheels for pycairo which use PEP 517 and cannot be installed directly

[gordicaleksa]

Hey!

Hm, interesting Tamas one of the coauthors of igraph develops all of these tools for Linux, actually, Windows users are usually second-class citizens having problems with igraph.

I had problems setting up igraph in my conda env (note I'm on Windows).
This initially solved the problem for me (for future Windows users looking at this thread):

1. Download appropriate wheels (see 2)) from here: https://www.lfd.uci.edu/~gohlke/pythonlibs/
2. pip install pycairo-1.20.0-cp38-cp38-win_amd64.whl
   pip install python_igraph-0.8.3-cp38-cp38-win_amd64.wh

But later I found the combination that works, now included inside the env yaml file:

• python-igraph==0.8.3
• pycairo==1.20.0

This SO link also helped: https://stackoverflow.com/questions/48131876/installation-of-pycairo-on-windows

My first advice is, try uninstalling and installing packages from scratch.
The second advice use conda envs instead of virtualenv.

Hope this somewhat helps.

[wrosko]

I'm currently running Ubuntu 20.04 and was getting the pycairo PEP error as well. What I ended up doing to get things working was:

• First head to the pycairo docs page and then clone the Github repo

• cd to the library then try to build the package while in the pytorch-gat env with python setup.py build and then python setup.py install (these were found on the pycairo docs page`)

• If package fails because you're missing cairo simply do the relevant things to get it on your system from the cairo webpage, then retry the python build of the package

• Run the tests to make sure package works (might need to pip install pytest: python setup.py test

@amiltonwong and @jamool2012 a potential solution for you. @gordicaleksa you might want to highlight this or I can do a PR on the docs/home page

[decoherencer]

also these can help if one is starting on fresh instance.
sudo apt install build-essential libcairo2-dev pkg-config python3-dev

[Kamleecoder]

I'm currently running Ubuntu 20.04 and was getting the pycairo PEP error as well. What I ended up doing to get things working was:

• First head to the pycairo docs page and then clone the Github repo
• cd to the library then try to build the package while in the pytorch-gat env with python setup.py build and then python setup.py install (these were found on the pycairo docs page`)
• If package fails because you're missing cairo simply do the relevant things to get it on your system from the cairo webpage, then retry the python build of the package
• Run the tests to make sure package works (might need to pip install pytest: python setup.py test

@amiltonwong and @jamool2012 a potential solution for you. @gordicaleksa you might want to highlight this or I can do a PR on the docs/home page

I solved my problem by sudo apt-get install libcairo2-dev

[ichsan2895]

I'm currently running Ubuntu 20.04 and was getting the pycairo PEP error as well. What I ended up doing to get things working was:

• First head to the pycairo docs page and then clone the Github repo
• cd to the library then try to build the package while in the pytorch-gat env with python setup.py build and then python setup.py install (these were found on the pycairo docs page`)
• If package fails because you're missing cairo simply do the relevant things to get it on your system from the cairo webpage, then retry the python build of the package
• Run the tests to make sure package works (might need to pip install pytest: python setup.py test

@amiltonwong and @jamool2012 a potential solution for you. @gordicaleksa you might want to highlight this or I can do a PR on the docs/home page

I solved my problem by sudo apt-get install libcairo2-dev

Thank you!
It works for me too by installing apt-get install libcairo2-dev.