SPATIALINDEX_LIBRARY Cmake

 

https://libspatialindex.org/

 QGIS:https://github.com/qgis/QGIS/blob/master/cmake/FindSpatialindex.cmake

Question:http://osgeo-org.1560.x6.nabble.com/Config-fails-on-find-of-spatialindex-library-td4939392.html