[pdal] GEOS support

[Matt Hanson]

Hello,

I wanted to crop a point cloud with a polygon.    cmake on PDAL (current
master) reports GEOS under "OPTIONAL packages have been found", however
when I try to crop a polygon in my xml file it says:

PDAL: Polygon cropping not supported unless built with GEOS

Do I need to explicitly tell PDAL to build with GEOS support?

Thanks!

matt
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