The program is written in C++. To compile under your flavor of Unix or MacOSX, extract all files to a single directory and type qmake, then make. That should be all you need to do. If it doesn't work, generate a project file using Trolltech's qmake or change the supplied nev2lkit.pro according to your Qt installation and C++ compiler requirements.
A Microsoft Visual Studio 6.0 project file is provided for compilation under Windows. As of this writing the non-commercial version of the Qt 3.2 framework for Windows is available only as a CD-Rom add-on of the book Blanchette, Summerfield: ``C++ GUI programming with Qt3'', ISBN 0131240722 (which offers in general a very nice introduction to Qt programming). For download of the GPL or evaluation version for other platforms visit the Trolltech web page. To compile on any platform an installation of the QWT-package (version 0.4.2) is needed.