How to build from scratch.  From a shell prompt do this stuff...

1. Edit the Makefile and make sure the right compiler is uncommented
   for your platform.

2. Windows only: run the "vcvars32" .bat or .cmd that comes with
   Visual C++.  This is important as the build process needs the
   Visual C++ environment variables set up such that they have no
   spaces in them.  Mine lives in:

        C:\Program Files\Microsoft Visual Studio\VC98\Bin

3. Windows: run jmake.cmd
   Unix: run jmake.sh

   Note: windows folks may have to remove a #include <values.h> from
   jamgram.c -- sorry.