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+You need the Gnu Triangulated Surfaces library (GTS) installed on your
+system to build portions of TerraGear.  GTS provides the needed tools
+and infrastructure to impliment our terrain simplification approach.
+We modeled our approach after the approach outlined in Michael
+Garland's paper here:
+
+    http://graphics.cs.uiuc.edu/~garland/software/terra.html
+
+You can get the latest version of GTS from:
+
+    http://gts.sourceforge.net/
+
+More information:
+
+  GTS stands for the GNU Triangulated Surface Library. It is an Open
+  Source Free Software Library intended to provide a set of useful
+  functions to deal with 3D surfaces meshed with interconnected
+  triangles. The source code is available free of charge under the
+  Free Software LGPL license.
+
+  The code is written entirely in C with an object-oriented approach
+  based mostly on the design of GTK+. Careful attention is paid to
+  performance related issues as the initial goal of GTS is to provide
+  a simple and efficient library to scientists dealing with 3D
+  computational surface meshes.
+
+  A brief summary of its main features:
+
+    * Simple object-oriented structure giving easy access to
+      topological properties. 
+    * 2D dynamic Delaunay and constrained Delaunay triangulations.
+    * Robust geometric predicates (orientation, in circle) using fast
+      adaptive floating point arithmetic (adapted from the fine work
+      of Jonathan R. Shewchuk).
+    * Robust set operations on surfaces (union, intersection, difference).
+    * Surface refinement and coarsening (multiresolution models).
+    * Dynamic view-independent continuous level-of-detail.
+    * Preliminary support for view-dependent level-of-detail.
+    * Bounding-boxes trees and Kd-trees for efficient point location
+      and collision/intersection detection.
+    * Graph operations: traversal, graph partitioning.
+    * Metric operations (area, volume, curvature ...).
+    * Triangle strips generation for fast rendering.