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An open source multi-platform implementation of Scheme written in C, SCM is an interpreter but it includes a Scheme-to-C compiler called Hobbit but that program generates C files that can be linked with the SCM executable. The program is primarily developed on Linux and Microsoft Windows these days but it has support in the source for the Amiga, DOS, the Atari ST, MacOS, OS/2, NOS/VE, Unicos and VMS, Unix and uses mostly common I/O libraries so should be a fairly easy port to other operating systems that have some POSIX compatibility.


  • Last known version: SCM version 5f2 (2015-07-15)
This is only provided in binary format or distribution packages for Linux and MS Windows, other platforms will have to be built from source.

Known issues

The 5fx branch appears no longer to compile under or for DOS even though there is supposedly explicit support for it.



SCM conforms to this standard and the author has explicitly stated that he will not release a version conforming to Revised(6) due to incompatibilities.


Open source software released under the GPL v2 with the SCM Exception.


  • Aubrey Jaffer (Main SMC author)
  • Tanel Tammet (Hobbit author)
  • Marc Espie (SMC Contributor)
  • Martin Michlmayr (SMC Contributor)