--- vtk-5.4.2.orig/Utilities/vtkgl2ps/README.VTK.txt
+++ vtk-5.4.2/Utilities/vtkgl2ps/README.VTK.txt
@@ -0,0 +1,27 @@
+This directory contains the sources for the GL2PS library.  The
+complete GL2PS library with documentation is available from here:
+
+  http://www.geuz.org/gl2ps/
+
+We thank Christophe Geuzaine <geuzaine@acm.caltech.edu> for
+distributing this library under a license compatible with VTK.
+
+Please read the COPYING.GL2PS license before you make any
+modifications to this copy of the GL2PS sources.
+
+
+Notes on how GL2PS is built in VTK
+----------------------------------
+
+CMakeLists.txt is conspicuous by its absence in this directory.
+Currently, the GL2PS sources are in two files, one header and the
+other the library.  The GL2PS code is only used in Rendering so we
+simply compile gl2ps.c in the Rendering directory and build the
+Rendering library along with the resulting gl2ps object file.  Since
+VTK ships with its own ZLIB library, GL2PS compressed output is
+enabled and GL2PS_HAVE_ZLIB is defined inside
+Rendering/CMakeLists.txt.  Similar is the case with the
+GL2PS_HAVE_LIBPNG flag.  
+
+In order to avoid linking errors we also have modified gl2ps to
+include vtk_zlib.h and vtk_png.h instead of the {zlib,png}.h headers.