This is a port of the CMU Gwydion project's implementation of the Dylan programming language. Dylan is an object-oriented language with many powerful features, including automatic memory management (garbage collection), generic functions (also known as multiple dispatch or multi-methods), multiple inheritance, a powerful and safe macro facility for extending the language's syntax, and a powerful class and function library. Though it is a DYnamic LANguage, it includes facilities for making compiled programs more efficient than many other dynamic languages. The Dylan language was originally developed by Apple, but the project was dropped just as the language definition was being finished and before a production-quality compiler was complete. The CMU Gwydion project and Harlequin have continued use and development of the language. For more information about the Dylan language, see the Dylan World site (http://www-dylan.uchicago.edu/). Gwydion Dylan actually contains two implementations of the language. One, called Mindy (Mindy Is Not Dylan Yet), is a bytecode compiler and interpreter that implements most of the language except for the macro facility. The other, d2c, is a compiler for the full language that uses C as its target "assembly language". The d2c compiler was written in Dylan and bootstrapped using Mindy. A copy of the d2c compiler binary is included with the port to bootstrap the entire system. As the Gwydion documentation says, Recompiling the entire system takes over an hour on 64meg 200mhz Pentium Pro running Windows/NT. This is almost all for the compilation of the d2c runtime and compiler; compiling just Mindy takes only a few minutes. d2c also uses lots of memory, especially when compiling itself: you want at least 48 meg, and more is better. For more information about building Gwydion dylan, see http://legend.gwydion.cs.cmu.edu/gwydion/dylan/docs/htdocs/unix-build.html. The Gwydion project home page is at http://legend.gwydion.cs.cmu.edu/gwydion/ -Peter S. Housel- housel@acm.org