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The original plan to run a Scheme script was to have GIMP start TinyScheme and TinyScheme would load tiny-fu as an extension. There were difficulties in going from Scheme to C to Scheme (initially to create wrapper functions for GIMP functions) so this approach has been abandoned in favour of the original method of going from C to Scheme to C to run Scheme scripts. Also updated dependencies to match those of GIMP. Don't use gtk+ 3.0 functions.
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