Add needed packages to readme

[josephfrazier]

Without these, I was getting errors about various .pc files being missing, see #5 (comment)

[brandoncc]

Thanks for this PR. Do you use sharp? I'm wondering if your need for these packages is coming from the use of that library, rather than the buildpack itself.

I ask because the issue you were originally referencing was about using sharp as far as I understand.

Before we say everyone needs these packages, I'd like to make sure that is the case. I'm my own testing, I haven't seen any of the issues you were having.

Can you tell me when you where experiencing the errors? Was it during build? Or after you ran a certain command?

What type of application are you using the buildpack on? I use it in a ruby on rails application, so maybe different types of applications have different needs. If that is the case, I would like to clarify it on the readme before merging.

[josephfrazier]

Thanks for the quick response! I do use sharp, and I think you're right in that I extrapolated from my use case. After I solved my problem in #5, I was probably too quick to assume that others would be experiencing the same problem. This change probably belongs in the sharp repo, so I'll close this and open a PR there. Sorry for the noise!

[brandoncc]

No need to apologize for the noise. There seems to be a common enough use case that we should probably address it here too. I think we should add a section to the readme for sharp users which contains your changes. Would you be up for opening that new PR?

If you do get the changes into the sharp repo instead, we should at least include a link in the readme of this repo.

I really appreciate you sharing your solution so everyone can find it!

[brandoncc]

Edit: I said new PR, but then I reopened this one. You are welcome to make the changes here or in a new PR :-)

[josephfrazier]

No need to apologize for the noise. There seems to be a common enough use case that we should probably address it here too. I think we should add a section to the readme for sharp users which contains your changes. Would you be up for opening that new PR?

If you do get the changes into the sharp repo instead, we should at least include a link in the readme of this repo.

I opened up a PR there, at lovell/sharp#2992, will wait to see how it goes before making more changes here.

I really appreciate you sharing your solution so everyone can find it!

Sure thing, and thanks for the buildpack in the first place!

[josephfrazier]

lovell/sharp#2992 didn't catch on, so I'd be happy to help add the docs here. Do you have a particular format/location in mind?

[brandoncc]

Hi @josephfrazier, I'm sorry I dropped the ball on this. I just merged a PR that does a great job updating the dependency information in the readme. If you would like to expand that documentation with a section about sharp, I'd be happy to merge. I think your PR from lovell/sharp was great, and you could just move that content over here and reference lovell/sharp in your comment. Of course, you should only need to reference the extra packages that you needed to add (just as this PR currently does).

Thank you for this contribution, I appreciate it.

[josephfrazier]

No worries, I know how busy things can get! I just pushed an update that moves the extra packages into a section that mentions/links sharp, let me know what you think.

[brandoncc]

This is great, thank you for spending time on this.

[josephfrazier]

Thank you!