Log Message:
Import guile20-2.0.11 as lang/guile20.

GUILE, GNU's Ubiquitous Intelligent Language for Extension, is a library
that implements the Scheme language plus various convenient facilities.
It's designed so that you can link it into an application or utility to
make it extensible. Our plan is to link this library into all GNU programs
that call for extensibility.

This is guile 2.0, the current stable version.