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-proj is a standard UNIX filter function which converts geographic
-longitude and latitude coordinates into cartesian coordinates by means
-of a wide variety of cartographic projection functions.
+PROJ is a generic coordinate transformation software, that transforms
+coordinates from one coordinate reference system (CRS) to another. This
+includes cartographic projections as well as geodetic transformations.
+
+This SlackBuild also includes the datum grid files for PROJ (excluding the
+regional resource packages).