So that links seems to be broken. But i guess it had the current patch to the
package, which i was trying to install atm. Which are the steps to apply it?
Sorry for my great ignorance of linux.
Thanks in advance.
The links that Marco Atzeri sent you are:
To apply the patch  in Linux, download the latest version of the package
$ tar -xf communications-1.2.1.tar.gz
$ rm communications-1.2.1.tar.gz
$ cd communications-1.2.1/
$ patch -p1 < ../octave-4.4-all.patch
$ cd ..
$ tar -zcf communications-1.2.1.tar.gz communications-1.2.1
$ rm -R communications-1.2.1
Then from within Octave:
>> pkg install communications-1.2.1.tar.gz