MASTER_SITES is defined in math/R/Makefile.extension, which should be
included by all R packages. Therefore, MASTER_SITES should not normally
be defined in the Makefile for an R package.
Calculates the Delaunay triangulation and the Dirichlet or Voronoi
tessellation (with respect to the entire plane) of a planar point set.
Plots triangulations and tessellations in various ways. Clips
tessellations to sub-windows. Calculates perimeters of tessellations.