For anyone who's interested, I wrote a quick hack that disables the need for any external files such as the pl*.fnt and cmap files for plplot to work by storing the necessary info in the code.

It then makes deploying plplot much easier inside an .app bundle, as the only file you need to give users is the /usr/local/lib/libplplotd.dylib file and any dependencies.

If anybody wants to beautify or improve this patch please do so, again it's only a quick hack, but I guess it might be helpful for some people...

https://github.com/houbysoft/short/blob/master/jan-plplot-5.9.9-no-additional-files-to-install.patch