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I was surprised to find that svn is required in order to use g.extension since GRASS moved to GitHub many years back. The interface from the GUI seems to lock up on launch. Maybe the lack of SVN is the reason? 
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<div>Michael<br>
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<font color="#929292" face="Calibri" style="font-style: normal; font-size: 11px;">_____________________________</font></div>
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<p style="margin-bottom: 0in;"><font color="#929292" face="Calibri" style="font-style: normal; font-size: 11px;"><font><span style="caret-color: rgb(94, 94, 94);">C. Michael Barton<br>
Associate Director, School of Complex Adaptive Systems (</span></font><a href="https://scas.asu.edu/" style="caret-color: rgb(94, 94, 94);">https://scas.asu.edu</a><font><span style="caret-color: rgb(94, 94, 94);">)<br>
Professor, School of Human Evolution & Social Change (<a href="https://shesc.asu.edu">https://shesc.asu.edu</a>)<br>
Director, Center for Social Dynamics & Complexity (<a href="https://complexity.asu.edu">https://complexity.asu.edu</a>)<br>
Arizona State University<br>
Tempe, AZ 85287-2701<br>
USA<br>
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Executive Director, Open Modeling Foundation (</span></font><a href="https://openmodelingfoundation.github.io/" style="caret-color: rgb(94, 94, 94);">https://openmodelingfoundation.github.io</a><font><span style="caret-color: rgb(94, 94, 94);">)<br>
Director, Network for Computational Modeling in Social & Ecological Sciences (<a href="https://comses.net">https://comses.net</a>)<br>
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personal website: <a href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a> <br>
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