[GRASS-dev] r.pi installation fails

[Paulo van Breugel]

Hi Devs

I am trying to install r.pi addon, but I am getting the following error 
message:

Fetching <r.pi> from GRASS GIS Addons repository (be patient)...
Compiling...
/usr/bin/ld: cannot open output file
/usr/local/grass7/grass-7.3.svn/lib/libgrass_rpi.7.3.svn.so:
Permission denied
collect2: error: ld returned 1 exit status
make[1]: *** [/usr/local/grass7/grass-7.3.svn/lib/libgrass_r
pi.7.3.svn.so] Error 1
/bin/sh: 1: cannot create
/usr/local/grass7/grass-7.3.svn/error.log: Permission denied
make: *** [r.pi.library] Error 2
ERROR: Compilation failed, sorry. Please check above error messages.

It seems it is not installing the plugin in the plugin folder but in the 
grass7 system folder?