Cannot build libffi custom buildpack in Heroku

Question

Have researched this and came across Problems with custom LIBFFI Heroku buildpack, where they suggest a forked libffi buildpack.

But even after following the directions there, can't seem to get it to compile properly. It fails with a number of No package 'libffi' found messages (full log below).

How can I get libffi compiled properly for a Heroku Python application?

requirements.txt file:

Flask==0.10.1
gunicorn==18.0
cryptography==0.3

Buildpack environment variable:

BUILDPACK_URL:                 git://github.com/mfenniak/heroku-buildpack-python-libffi.git

git push errors:

https://gist.github.com/HanSooloo/8a9290c032ed603f6cf4#file-libffi-errors

UPDATE

Feeling very silly as I have clearly done a bad Copy/Paste in setting the BUILDPACK_URL environment variable in Heroku.

The forked buildpack at h++ps://github.com/kennethjiang/heroku-buildpack-python-libffi has the same Readme.md file as the original one at h++ps://github.com/mfenniak/heroku-buildpack-python-libffi.

Which means, if I simply copy/paste the instructions from 'kennethjiang's repo, I will actually be pointing to 'mfenniak's original repo:

kennethjiang's Readme.md:

$ heroku config:add BUILDPACK_URL=git://github.com/mfenniak/heroku-buildpack-python-libffi.git

Should have done:

$ heroku config:add BUILDPACK_URL=git://github.com/kennethjiang/heroku-buildpack-python-libffi.git

score 2 · Answer 1 · answered May 19 '16 at 00:39

2

Currently changing the BUILDPACK_URL is no longer needed.

Just add either cffi or cryptography in requirements.txt and libffi will be bootstrapped automatically.

answered May 19 '16 at 00:39

Michael van de Waeter

1,473
15
29

score 1 · Accepted Answer · answered May 15 '14 at 12:59