Using Both Matplotlib And Rpy2 With Multi-buildpacks On Heroku

I'm trying to use a multi-buildpack setup on Heroku with these two buildpacks: https://github.com/virtualstaticvoid/heroku-buildpack-r.git https://github.com/dbrgn/heroku-buildpack

Solution 1:

Ok, I figured it out. It turns out that the correct library wasn't in /app/vendor/gcc-4.3/gcc-4.3/lib64/ after all, but just in /usr/lib. That explains why changing the order of the directories in LD_LIBRARY_PATH had no effect, since it wasn't in any of them.

There must be some logic that looks in the directories of LD_LIBRARY_PATH, and it doesn't find a match there, then looks in /usr/lib. That is why it works some of the time. The file in /app/vendor/R/lib64/R/lib/ must have been close enough to be considered a match (so it didn't look in /usr/lib), but in the wrong format so it caused a later error.

The fix is just to include /usr/lib in LD_LIBRARY_PATH. I added /usr/local/lib as well, for good measure. You should now use:

heroku config:set LD_LIBRARY_PATH=/usr/lib:/usr/local/lib:/app/vendor/R/lib64/R/modules:/app/vendor/R/lib64/R/lib:/app/vendor/gcc-4.3/lib64