Introduction
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"Guile" (which can stand for _GNU Ubiquitous Intelligent Language
Extension_) is the GNU extension language. It started out as an
embeddable Scheme interpreter, and has rapidly evolved into a
kitchen-sink package including a standalone Scheme interpreter, an
embeddable Scheme interpreter, several graphics options, other languages
that can be used along with Scheme (for now just _ctax_ and _Tcl_), and
hooks for much more.