## Introduction

This document describes how to install and use MIT/GNU Scheme, the UnCommon Lisp. It gives installation instructions for all of the platforms that we support; complete documentation of the command-line options and environment variables that control how Scheme works; and rudimentary descriptions of how to interact with the evaluator, compile and debug programs, and use the editor.

This document discusses many operating-system specific features of the MIT/GNU Scheme implementation. In order to simplify the discussion, we use abbreviations to refer to some operating systems. When the text uses the term unix, this means any of the unix systems that we support, including GNU/Linux, macOS, and the BSD variants.

The primary distribution site for this software is

    https://www.gnu.org/software/mit-scheme/

Although our software is distributed from other sites and in other media, the complete distribution and the most recent release is always available at our site.

The release notes for the current release are at

    https://www.gnu.org/software/mit-scheme/release.html

To report bugs, use the bug-reporting tool at

    https://savannah.gnu.org/projects/mit-scheme/

Please include the output of the `identify-world` procedure (see Basics of Starting Scheme), so we know what version of the system you are using.