[Plplot-general] plgriddata() error from x21c

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hi list,
the example 21 seems to work ok. i get the 3 pictures i see
with http://plplot.sourceforge.net/examples/demo21.php
but with delauny and natural neighboirs missing.
something to worry about ?

*** PLPLOT ERROR ***
plgriddata(): you must have Qhull to use GRID_DTLI., aborting operation