MIT/GNU Scheme

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.

Release status and future plans

Current releases
Stable	Testing
10.1.11	11.0.90

The releases provide binaries that run on i386, x86-64, and aarch64 machines running unix systems. They have been tested on GNU/Linux, NetBSD, and macOS systems. We no longer support OS/2, DOS, or Windows, though it's possible that this software could be used on Windows Subsystem for Linux (we haven't tried).

Recent release notes are here.

Other potential projects can be found on the tasks page.

Download

MIT/GNU Scheme is available in binary form for a variety of systems.

Please check the downloaded file for a correct MD5 checksum before submitting a bug report. Each distribution below has its own list of MD5 checksums.

Documentation for MIT/GNU Scheme is available online, as is documentation for most GNU software. The MIT/GNU Scheme documentation is available in HTML and PDF formats on this page, and in other formats as downloads.

Stable release 10.1.11
File	Arch	Instructions	Notes
Unix binary	i386	unix installation
Unix binary	x86-64	unix installation
Portable SVM	(any)	unix installation	For use on any 64-bit unix system.
macOS binary	x86-64		Compiled on macOS 10.14.
Source (.tar.gz)			For unix systems; uses linefeeds as line delimiters.
Change log
MD5 checksums

Documentation:
	HTML (multi-page)	PDF	MIT/GNU Scheme User's Manual
	HTML (multi-page)	PDF	MIT/GNU Scheme Reference
	HTML (multi-page)	PDF	The FFI Reference Manual
	HTML (multi-page)	PDF	The SOS Reference Manual
HTML (one page)		PDF	IMAIL User's Manual
HTML (one page)		PDF	MIT/GNU Scheme Blowfish Plugin Manual
HTML (one page)		PDF	MIT/GNU Scheme GDBM Plugin Manual

Testing release 11.0.90
File	Arch	Instructions	Notes
Unix binary	x86-64	unix installation
Unix binary	aarch64le	unix installation
Portable SVM	(any)	unix installation	For use on any 64-bit unix system.
macOS binary	x86-64		Compiled on macOS 10.15.
Source (.tar.gz)			For unix systems; uses linefeeds as line delimiters.
Change log
MD5 checksums

Documentation:
HTML (one page)	HTML (multi-page)	PDF	MIT/GNU Scheme User's Manual
HTML (one page)	HTML (multi-page)	PDF	MIT/GNU Scheme Reference
HTML (one page)	HTML (multi-page)	PDF	The FFI Reference Manual
HTML (one page)	HTML (multi-page)	PDF	The SOS Reference Manual
HTML (one page)		PDF	IMAIL User's Manual
HTML (one page)		PDF	MIT/GNU Scheme Blowfish Plugin Manual
HTML (one page)		PDF	MIT/GNU Scheme GDBM Plugin Manual

Older versions can be downloaded here.

Note that you cannot build a working system from the source unless you have a working MIT/GNU Scheme compiler to do the compilation. (This doesn't apply to the portable C source, which requires only a C compiler.) This means that if the above binaries don't work on your system, it is pointless to try building a custom set of binaries from the source code.

Additional documentation

MIT/GNU Scheme mostly conforms to the R7RS (small) standard. It also fully supports these SRFIs:

Supported SRFIs:
HTML		0: `cond-expand`
HTML		1: List library
HTML		2: `and-let*`
HTML		6: Basic string ports
HTML		8: `receive`
HTML		9: Defining record types
HTML		14: Character-set Library
HTML		23: Error reporting mechanism
HTML		27: Sources of random bits
HTML		30: Nested multi-line comments
HTML		39: Parameter objects
HTML		62: S-expression comments
HTML		69: Basic hash tables
HTML		115: Scheme Regular Expressions
HTML		124: Ephemerons
HTML		125: Intermediate hash tables
HTML		128: Comparators (reduced)
HTML		131: ERR5RS Record Syntax (reduced)
HTML		133: Vector Library (R7RS-compatible)
HTML		143: Fixnums

Contact us

Please report bugs using the bug-tracking system.
We can be contacted on the mit-scheme-devel mailing list.
New releases of MIT/GNU Scheme are announced on the mit-scheme-announce mailing list.

Getting involved

Development of MIT/GNU Scheme, and GNU in general, is a volunteer effort, and you can contribute. For information, please read How to help GNU. If you'd like to get involved, it's a good idea to join the discussion mailing list (see above).

Development: For development sources, bug and patch trackers, and other information, please see the project page at Savannah.
Maintainer: MIT/GNU Scheme is currently being maintained by Chris Hanson. Please use the mailing lists for contact.

Licensing

MIT/GNU Scheme is free software; you can redistribute it and/or modify it under the terms of the GPL as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.