1 files changed, 31 insertions, 1 deletions
diff --git a/gis/pdal/README b/gis/pdal/README
index e0451f2b20..95f8695aa2 100644
--- a/gis/pdal/README
+++ b/gis/pdal/README
@@ -7,4 +7,34 @@ with multi-dimensional emitted-pulse scanning systems. While PDAL is
 not explicitly limited to working with LiDAR data formats, its initial
 rollout is focused in that area.
 
-Optional dependencies: jsoncpp, laszip, hdf5, OpenSceneGraph.
+PDAL includes several plugins needed for some extended features or to
+write/read data in specific formats. The build of these plugins
+requires optional dependencies included in Slackware 15.0 or available
+as packages from Slackbuilds.org. Other plugins need third parts
+dependencies that are not available here.
+
+If their dependencies (autodetected) are installed, the script enables
+by default the build of the supported plugins. You can disable each of
+them by passing to the slackwbuild its environment variable set as
+"no" (for example E57=no ./pdal.SlackBuild).
+
+Plugins enabled by default if their dependencies are installed (see
+README.SBo to know what feature they extend):
+
+- E57: requires xerces-c
+- OSG: requires OpenSceneGraph
+- DRACO: requires libdraco
+
+HDF, ICEBRIDGE do not require optional deps
+
+Other optional dependencies (autodetected) that improve the
+functionality of PDAL are jsoncpp and laszip. The installation of
+laszip is strongly recommended.
+
+PDAL can include also the Matlab plugin, that allows to write data to
+a .mat file. Since the standard MATLAB is a proprietary software, the
+build of this plugin is disabled by default. If you need this plugin
+launch the script with MATLAB=yes ./pdal.SlackBuild
+
+Warning: the build of these plugin does not support free platforms
+compatible or alternative to MATLAB, like Octave or Scilab.