wip/scm 5.5.5 NetBSD

Scm is a portable Scheme implementation written in C including the following features: * Conforms to Revised^5 Report on the Algorithmic Language Scheme and the IEEE P1178 specification. * Support for SICP, R2RS, R3RS, and R5RS scheme code. * Supports inexact real and complex numbers, 30 bit immediate integers and large precision integers. * Supports many Common Lisp functions. * Char-code-limit, most-positive-fixnum, most-negative-fixnum, and internal-time-units-per-second constants. *Features* and *load-pathname* variables. * Arrays and bit-vectors. String ports and software emulation ports. I/O extensions providing ANSI C and POSIX.1 facilities. * Interfaces to standard libraries including REGEX string regular expression matching and the CURSES screen management package. * Available add-on packages including an interactive debugger, database, X-window graphics, BGI graphics, Motif, and Open-Windows packages. * A compiler (HOBBIT) and dynamic linking of compiled modules. * User definable responses to interrupts and errors, Process-syncronization primitives. Setable levels of monitoring and timing information printed interactively (the verbose function). Restart, quit, and exec.