Dependencies not being installed, mtr

[tjfoster]

I'm attempting to install mtr. When I ps:exec and issue an mtr command, I get missing library errors. As I add the missing libraries to Aptfile, I get new missing library errors. The dependencies are deep so I could chase this all day if I have to do it manually. Is there a flag or something I can add to install the dependencies for me?

[lazyatom]

I wonder if this is related to #35 (comment)

[KevinBrolly]

This is happening because the mtr library has multiple dependencies such as:

libgtk2.0-0
libxfixes3
libatk1.0-0
libxinerama1
libxi6

These dependencies are all available on the Heroku build image, but not the runtime image (as seen in the tables here - https://devcenter.heroku.com/articles/stack-packages). So when the application is building apt can see these packages available and therefore does not install them again, but at runtime the packages are then missing and this is why you then getting the missing library errors.

Unfortunately the only way to solve this would be to identify and install these dependencies in your Aptfile yourself.