lang/scheme48 1.9.2p0 OpenBSD

Scheme 48 is an implementation of the Scheme programming language as described in the Revised5 Report on the Algorithmic Language Scheme. It is based on a compiler and interpreter for a virtual Scheme machine. Scheme 48 tries to be faithful to the Revised5 Scheme Report, providing neither more nor less in the initial user environment. It is based on a byte-code interpreter and is designed to be used as a testbed for experiments in implementation techniques and as an expository tool.

It has a foreign function interface for calling functions from C and comes with a regex library, and a POSIX interface. It is supported by SLIB the portable Scheme library.