mit-scheme-dbg 7.7.90+20070205-1ubuntu1 (i386 binary) in ubuntu gutsy

 MIT/GNU Scheme is an implementation of the Scheme programming language,
 providing an interpreter, compiler, source-code debugger, integrated
 Emacs-like editor, and a large runtime library. MIT/GNU Scheme is best
 suited to programming large applications with a rapid development
 cycle.
 .
 This package contains debugging files for the development
 environment. These files provide support for debugging the MIT/GNU
 Scheme system, and are useful only if you need to see the system
 internals while you are debugging.