Install GRASS Addon within QGIS

Question

I want to install some GRASS-Addons to use them in QGIS. Therefore I run GRASS-Plugin in QGIS an open the GRASS-Shell type: g.extension

GRASS opens then i go to "optional", activate "System installation" and type the extensionname "r.viewshed.cva"

after this I run the whole thing and get the following output:

(Tue Nov 05 15:53:05 2013)
g.extension -s extension=r.viewshed.cva svnurl=http://svn.osgeo.org/grass/grass-addons/grass6 which: wget: unknown command WARNING: GRASS_ADDON_PATH is not defined, installing to ~/.grass6/addons/ Fetching from GRASS-Addons SVN (be patient)... A r.viewshed.cva\description.html A r.viewshed.cva\Makefile A r.viewshed.cva\r.viewshed.cva.py Checked out revision 58151. Compiling ... C:/OSGeo4W/apps/grass/GRASS-~1.3/include/Make/Grass.make:423 : warning: overriding commands for target C:\Users\Warsow\.grass6/1/addons/.tmp/1084.0/dist.i686-pc- msys/bin' C:/OSGeo4W/apps/grass/GRASS-~1.3/include/Make/Grass.make:414 : warning: ignoring old commands for target C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686-pc- msys/bin' make: C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686 -pc-msys/tools/g.echo.exe: Command not found make: C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686 -pc-msys/tools/g.echo.exe: Command not found mkdir -p C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686-pc-msys/bin mkdir -p C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686-pc-msys/include/grass mkdir -p C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686-pc-msys/etc mkdir -p C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686-pc-msys/driver mkdir -p C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686-pc-msys/driver/db mkdir -p C:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686-pc-msys/fonts make: *** No rule to make target r.viweshed.cva.py', needed byC:\Users\Warsow.grass6/1/addons/.tmp/1084.0/dist.i686 -pc-msys/scripts/r.viweshed.cva.py'. Stop. ERROR: Compilation failed, sorry. Please check above error messages. rm: cannot remove directory `C:\Users\Warsow\.grass6/1/ad dons/.tmp/1084.0/r.viewshed.cva': Permission denied (Tue Nov 05 15:53:12 2013) Command finished (7 sec)

I don't know why it doesn't work - could somebody help me?

Win 7 QGIS 2.0 GRASS 6.4.3

Answer 1

The solution is given in the r.viewshed.cva.py

It is a Python script and the line 189 is:

 grass.run_command("r.viewshed",....

So you need to install r.vieshed first but most Windows computers don't have a common compiler and a building environment built. The developers compile every night the addon modules for Windows (see Installing an addon in winGRASS 7.0 for complete dummy , it is the same for GRASS GIS 6.4.3). They are in Win GRASS 6.4.3 addons

If you don't want to use g.extension, download r.viewshed.zip and r.viewshed.cva.zip, an unzip in your GRASS_ADDON_PATH (C:\Users\Warsow.grass6/1/addons/? from your output)