TL;DR:

$ git remote add StijnKuipersIsAsshole https://github.com/runesoeknudsen/GerberTools
$ git fetch StijnKuipersIsAsshole
remote: Counting objects: 29, done.
remote: Total 29 (delta 24), reused 24 (delta 24), pack-reused 5
Unpacking objects: 100% (29/29), done.
From https://github.com/runesoeknudsen/GerberTools
 * [new branch]      linuxHAck  -> StijnKuipersIsAsshole/linuxHAck
 * [new branch]      master     -> StijnKuipersIsAsshole/master
$ git checkout linuxHAck
Branch 'linuxHAck' set up to track remote branch 'linuxHAck' from 'StijnKuipersIsAsshole' by rebasing.
Switched to a new branch 'linuxHAck'
$ xbuild
…

Also, Codeplex RIP; hence a reputable source of the DotNetZip.dll and other deps WANTED.

There's a few other resources in the project where the icon needs to be extracted. Would you be able to look at the errors from running build.sh from here please?
https://github.com/InfernoEmbedded/GerberTools

Once that's done, I can start working on getting Travis CI to build this

I would love to support the project, however I am very busy at the moment.

But to help out as much I can now, here is the way I extract the icons as fare as I recall it:
1: Local the embedded images by searching for "System.Drawing.Bitmap"
2: Extract and decode the base64 image, e.g. by using an online tool like: https://www.motobit.com/util/base64-decoder-encoder.asp
3: Open it in GIMP and save it again in order to make Mone be happy (That part to some time to realise)
4: Use the file instead of the embedded code

Suggestion:
Maybe it is enough to extract and decode the image and re-save it in GIMP and afterwards encode it to base64 again and replace the existing one. It is worth a try.

Thanks for the suggestion, I'll give it a try