Comment # 26 on bug 969715 from Bruno Friedmann

To add informations : without geos-3.5 postgis will loose some functionnality

- GEOS geometry library, version 3.3 or greater, but GEOS 3.5+ is recommended
to take full advantage of all the new functions and features. Without GEOS 3.5,
you will be missing some major enhancements such as ST_ClipByBox2D and
ST_Subdivide. GEOS is available for download from http://trac.osgeo.org/geos/
and 3.4+ is backward-compatible with older versions so fairly safe to upgrade.