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Blasvis makes use of the plplot library which is available under the GPL and runs on a variety of platforms. An additional patch is needed currently against version 5.1.0) to get some of the features to work correctly. These patches are available here if you are interested. This is a slight pain. On the other hand plplot is FREE. It also has good support for a variety of on-screen and graphics formats, including ps, eps, png, jpeg, X11 and tk. The changes are now being incorporated into the plplot library and future versions will work out of the box. As of version 5.3.0 the plplot library no longer needs patching. Use of the latest version of plplot is recommended.
Blasvis can be compiled without support for plplot. Obvious this means no graphical output is available. Blasvis can still be useful to extract data from model output files, perform some processing or interpolation on it and output the results as an ASCII file.
Once the plplot library is installed the software should run on most version of UNIX or Windows with a relatively modern C++ compiler. It has only been fully tested with gcc 2.95.4 under Linux 2.4 (Debian 3.0) and gcc 3.3 under Linux 2.4 (Debian testing).