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+This directory contains various third-party opensourced
+system-building tools.
+
+The code here is current as of February 7, 2004; you may want
+to check the originating project's homepages to see if more recent
+versions are available.
+
+"defsystem.lisp" is part of the clocc project on SourcForge:
+<http://sourceforge.net/projects/clocc>.  It's a "system definition
+facility" which provides functionality similar to that offered by
+the Unix "make" program.  It was originally written by Mark Kantrowitz
+and has been maintained and enhanced by many people; I believe that
+Marco Antoniotti is currently the principal developer.  This is
+version 3.4i of DEFSYSTEM (which is often called "MK-DEFSYSTEM").
+Note that, for historical reasons, DEFSYSTEM will try to redefine
+the CL:REQUIRE function.
+
+"asdf.lisp" is Another System Definition Facility and is available as
+part of the cclan project on SourceForge:
+<http://sourceforge.net/projects/cclan>.  It was written by and
+is maintained by Daniel Barlow.
+
+"asdf-install" is a library which can be used to download CL packages
+from the Internet and which uses ASDF to build and install them.  It's
+also part of the cclan project and was originally written (for SBCL)
+by Dan Barlow.  It's since been ported to several other CL
+implementations; Marco Baringer did the OpenMCL port.
+
+There's excellent documentation on asdf-install in the asdf-install/doc
+directory.  As that document mentions, asdf-install is designed to use
+the GnuPG package to validate cryptographic signatures associated with
+asdf-install-able packages, though it can apparently be configured to
+work in an environment in which GnuPG is not available.
+
+Downloading code from publicly-writable Internet sites - without the
+ability to verify that that code's really what it claims to be and
+from the author who claims to have provided it - is obviously a
+dangerous and unwise thing to do.  It's strongly recommended that
+people ensure that GnuPG is installed (and ensure that asdf-install is
+configured to use it) before using asdf-install to download packages.
+
+(GnuPG packages for OSX are available from <http://macgpg.sourceforge.net>.
+Most Linux distributions offer GnuPG through their packaging system;
+further information on GnuPG is available at <http:///www.gnupg.org>.
+
+