I'm working on a project that requires imagemagick to work on the Heroku 16 stack. When using the buildpack, I get the following error:
libgvc.so.6: cannot open shared object file: No such file or directory
I was able to fix the problem by including the GraphViz buildpack. In order to get Imagemagick working on Heroku-16 you need to add the imagemagick and GraphViz buildpacks to your project.