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@@ -5,8 +5,19 @@
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<em>g.extension</em> downloads and installs, removes or updates
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extensions (addons) from the official
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<a href="http://grass.osgeo.org/grass70/manuals/addons/">GRASS GIS Addons repository</a>
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-or user-specified source
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-into the local GRASS GIS installation.
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+or user-specified source into the local GRASS GIS installation.
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+<p>
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+Two types of extensions are supported:
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+<ul>
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+<li>Python scripts: they are installed without the need of compilation or (usually)
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+ the need of special dependencies.</li>
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+<li>Source code (mostly written in C programming language; may also be written
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+ in C++, Fortran or other languages): while on MS-Windows systems the requested
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+ GRASS GIS extension is downloaded pre-compiled from the GRASS GIS site, on Unix
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+ based systems the installation is preceeded by the automated download of the
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+ extension's source code along with subsequent compilation and installation.
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+ This requires a compiler environment to be present on the user's computer.</li>
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+</ul>
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<h3>Managing installed extensions</h3>
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@@ -110,6 +121,19 @@ Removal of a locally installed extension:
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g.extension extension=r.stream.distance operation=remove
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</pre></div>
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+<h2>TROUBLESHOOTING</h2>
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+
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+Since extensions have to be compiled on Unix based systems (Linux, Mac OSX etc.)
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+unless a Python extension is installed, a full compiler environment must be
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+present on the user's computer.
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+
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+<h3>ERROR: Please install GRASS development package</h3>
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+
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+While GRASS GIS is available on the user's computer, the respective development
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+package is lacking. If GRASS was installed from a (Linux) repository, also the
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+grass-dev* package (commonly named "grass-dev" or "grass-devel", sometimes along
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+with the version number) must be installed.
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+
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<h2>SEE ALSO</h2>
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<em>
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Markus Neteler