In order to install r.sulf.nnbathy into grass 7.0 I suggest to run the next lines into a GNU/Linux bash shell (Tested on ubuntu 12.04). \\\ cd /tmp #download and install nn library svn checkout https://nn-c.googlecode.com/svn/nn cd nn ./configure make sudo make install #download and install r.surf.nnbathy cd /usr/local/grass70/inst/grass-7.0.svn/scripts/ #or, more in general: cd /PATH_TO_THE_INTALLATION_FOLDER_OF_GRASS/scripts/ sudo wget -O r.surf.nnbathy https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.surf.nnbathy/r.surf.nnbathy sudo chmod ugo+x r.surf.nnbathy