I tried to run that file : https://github.com/flow-project/flow/blob/master/environment.yml in a dockerfile and I found some conflicts packages ( see the image) <img width="721" alt="capture d ecran 2018-08-27 a 15 54 15" src="https://user-images.githubusercontent.com/19914496/44690988-a1c4df00-aa11-11e8-85d7-65acf27a636f.png"> Is the version of matplotlib really important ?