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Editorial Team
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Asked: 2026-06-17T19:33:23+00:00

I’v successfully installed numpy and scipy using the method described in this answer. Then

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I’v successfully installed numpy and scipy using the method described in this answer. Then I wanted to add scikit-learn so at first I tried adding scikit-learn==0.11 to the requirements.txt and when pushed to heroku I got an error message:

ImportError: liblapack.so.3gf: cannot open shared object file: No such file or directory

So I’ve added to LD_LIBRARY_PATH the path where I have liblapack.so.3gf but then I got this:

ImportError: libgfortran.so.3: cannot open shared object file: No such file or directory

I believe that heroku doesn’t have fortran compiler, but maybe I wrong. How can I resolve this?

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1 Answer

  1. Editorial Team

    Based on these pointers, I just finished an installation of scikit-learn on heroku. I was quite happy to see that there is no need to get custom binaries, but that setting some environments did the trick 🙂

    You can find the additional custom step in my fork of the buildpack of wyn:
    https://github.com/ToonTimbermont/heroku-buildpack-python

    The key was to set the proper values for LD_LIBRARY_PATH:
    export LD_LIBRARY_PATH=$(pwd)/vendor/lib:$(pwd)/vendor/lib/atlas- base:$(pwd)/vendor/lib/atlas-base/atlas

    I also added these paths to the heroku config:
    heroku config:add LD_LIBRARY_PATH=/app/.heroku/vendor/lib/atlas-base/atlas:/app/.heroku/vendor/lib/atlas-base:/app/.heroku/vendor/lib/

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