1 The General Polygon Clipper GPC library is written by Alan Murta
2 <gpc@cs.man.ac.uk>. Copyright information for the library is contained in
3 the individual source files `gpc.c' and `gpc.h' in the src/ directory of
4 the R source package. For more information about the library itself, see
5 http://www.cs.man.ac.uk/aig/staff/alan/software/.
7 The R interface to the GPC library is written by Roger Peng