You *must* have the libnurbs++ package installed on your system to
build portions of TerraGear".

You can get the latest version of libnurbs++ from:

    http://libnurbs.sourceforge.net/

IMPORTANT!  If you are using gcc-3.4.x (or newer) you will need to apply
a patch to your nurbs++ tree to successfully compile.  Look for the file
called PATCH-nurbs++-gcc-3.4.x in the current directory.  Now cd to the
top level of your fresh nurbs++-3.0.11 source tree and run:

    patch -p0 < /path/to/patch/file

Good luck!


More information:

  Non-Uniform Rational B-Splines (NURBS) curves and surface are
  parametric functions which can represent any type of curves or
  surfaces. This C++ library hides the basic mathematics of
  NURBS. This allows the user to focus on the more challenging parts
  of their projects. The library also offers a lot of features to help
  generate NURBS from data points.

  The NURBS++ package includes a matrix library, an image manipulation
  library, a numerical library and a NURBS library. They can all be
  used on their own but they are all developped to support my NURBS
  needs.

  NURBS++ is being revived under sourceforge as the nurbs++ project
  (it is under the libnurbs directory for obvious reasons). Please use
  the sourceforge tools to send bug reports, feature requests, etc.

  This library is now used in the Mind's Eyes project and also in the
  Innovation3D project. Both projects aim at creating a free 3D
  modeller for UNIX machines. If you know other projects which use the
  library please let me know. It helps justify the effort I put into
  it.

  The library is under the GNU Library Public Licence term. This means
  it's free. You can copy it, modify it and even enjoy it. You do have
  to add my name as the author of the work, after all this is still
  copyrighted material. If the above license is bad for you, talk to
  me. I'm sure we can work something out.