On the Inkscape project we received a patch from the folks at Glimmer
labs which adds Scheme functionality. It uses the TinyScheme
interpreter which looks like it's also being used by GIMP. From what I
can tell, it seems that GIMP is including TinyScheme in the source tree.
Is that your long term plan? Do you expect TinyScheme to be an external
library at some point? If we were using it in Inkscape also, would that
change the answer? Is your TinyScheme patched for UTF-8?