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<p style="margin:14px 0px 12px">Processing grass algorithms claim that grass is not installed. Launching grass gives the below message [1]. In case is any help, I provide the processing log [2]. Grass runs from inside the application [3] and the grass provider points to there [4].<span style="font-size:large;font-weight:600"><br>
</span></p><p style="margin:14px 0px 12px">[1] <span style="font-size:large;font-weight:600">Missing dependency.This algorithm cannot be run :-( </span></p>
<p style="margin:12px 0px">This algorithm requires GRASS to be run. Unfortunately, it seems that GRASS is not installed in your system, or it is not correctly configured to be used from QGIS</p>
<p style="margin:12px 0px"><a href="http://docs.qgis.org/2.0/html/en/docs/user_manual/processing/3rdParty.html"><span style="color:rgb(0,0,255)">Click here</span></a> to know more about how to install and configure GRASS to be used with QGIS</p>
<p style="margin:12px 0px"><br></p><p style="margin:12px 0px">
</p><p style="margin:0px">[2] processing.runalg("grass:v.voronoi","/Applications/QGIS.app/Contents/MacOS/../Resources/python/plugins/processing/tests/data/points.shp",False,False,"270778.60198,270855.745301,4458921.97814,4458983.8488",-1,0.0001,0,None)</p>
<p style="margin:0px"><br></p><p style="margin:0px">[3] /Applications/QGIS.app/Contents/MacOS/grass/grass.sh<br></p><p style="margin:0px">[4] /Applications/QGIS.app/Contents/MacOS/grass<br></p></div>