[plt-scheme] Modules, structs and environments

Chongkai's answer should work with minimal hassle.  If you'd like more
hassle but more control, IIRC you need to create your own namespace,
attach whatever modules you need to that namespace, and then
parameterise eval with that namespace.  You could use the functions in
namespace.plt to get you going.

http://planet.plt-scheme.org/package-source/schematics/namespace.plt/1/0/doc.txt

HTH,
Noel