[GRASS-user] installing addons grass 6.4.3svn-ubuntu 11.10

[ciskoh]

Hi all,
I know this is quite a recurrent topic, but I couldn't find any solution on
my own.

Problem is I need to install grass addon r.viewshed.
I run Grass 6.4.3svn from http://ppa.launchpad.net/grass/grass-stable/ubuntu
on ubuntu 11.10 (virtualised on a macbook, but that shouldn't be an issue).
And I've installed grass-dev

1)

I've tried it with:
 g.extension r.viewshed

and the result was a huge output (Ill post the whole thing if required) that
ended with:

sh: Can't open /usr/lib/grass64/tools/g.html2man
make[2]: ***
[/home/matt/Desktop/grass/prato/visibilita/.tmp/matt-ubuntu/18805.0/dist.i686/man/man1/r.viewshed.1]
Error 127
make[2]: Leaving directory
`/home/matt/Desktop/grass/prato/visibilita/.tmp/matt-ubuntu/18805.0/r.viewshed'
make[1]: *** [mancmd] Error 2
make[1]: Leaving directory
`/home/matt/Desktop/grass/prato/visibilita/.tmp/matt-ubuntu/18805.0/r.viewshed'
make: *** [default] Error 2
ERROR: Compilation failed, sorry. Please check above error messages.

2) Then I tried with the GUi (Settings>>Install extension from add-ons)
which I believe calls g.extension.py and a an error pop-up shows up:

Traceback (most recent call last):
  File "/usr/lib/grass64/etc/gui/scripts/g.extension.py", line 802, in
<module>
    sys.exit(main())
  File "/usr/lib/grass64/etc/gui/scripts/g.extension.py", line 767, in main
    list_available_extensions()
  File "/usr/lib/grass64/etc/gui/scripts/g.extension.py", line 179, in
list_available_extensions
    url = "http://grass.osgeo.org/addons/grass%s/modules.xml" %
grass.version()['version'].split('.')[0]
KeyError: 'version'

3)
Then I tried the two procedures described 
http://osgeo-org.1560.n6.nabble.com/i-pr-gt-g-extension-and-compiling-error-on-ubuntu-11-10-64-bit-td4352067.html
here  

if I go into /grass64/bin/r.viewshed/ folder and I type make
MODULE_TOPDIR=/usr/lib/grass64 I get:

Makefile:8: /usr/local/grass64/include/Make/Module.make: No such file or
directory
make: *** No rule to make target
`/usr/local/grass64/include/Make/Module.make'.  Stop.

If I go for  "sudo make" I get:

../..//include/Make/Module.make:25: warning: overriding commands for target
`install'
../..//include/Make/Rules.make:90: warning: ignoring old commands for target
`install'
Makefile:50: warning: overriding commands for target
`/usr/lib/grass64/bin/r.viewshed'
../..//include/Make/Module.make:15: warning: ignoring old commands for
target `/usr/lib/grass64/bin/r.viewshed'
g++ -L/usr/lib/grass64/lib -Wl,-Bsymbolic-functions -Wl,--export-dynamic
-Wl,-rpath-link,/usr/lib/grass64/lib   -o /usr/lib/grass64/bin/r.viewshed
OBJ.i686-pc-linux-gnu/main.o OBJ.i686-pc-linux-gnu/distribute.o
OBJ.i686-pc-linux-gnu/eventlist.o OBJ.i686-pc-linux-gnu/grid.o
OBJ.i686-pc-linux-gnu/grass.o OBJ.i686-pc-linux-gnu/viewshed.o
OBJ.i686-pc-linux-gnu/rbbst.o OBJ.i686-pc-linux-gnu/statusstructure.o
OBJ.i686-pc-linux-gnu/visibility.o -lgrass_gis.6.4.3svn
-lgrass_datetime.6.4.3svn -lz     -lgrass_iostream.6.4.3svn
/usr/bin/ld: cannot open output file /usr/lib/grass64/bin/r.viewshed: Is a
directory
collect2: ld returned 1 exit status
make: *** [/usr/lib/grass64/bin/r.viewshed] Error 1


SO right now I'm out of solutions, could somenone guide me through this
f***** addons installation?

Thanks 



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