> The latest release of the communications package is from 2015-04-04.
> Now I found a site _https://savannah.gnu.org/patch/?9019_ with the
> (crucially needed) modification of the qammod/qamdemod files with
> Gray coding. This patch seems to be from June 2016 and it hasn't found
> its way into the package. True? Is there any way to implement it, as
> without Gray coding these modulators are of limited use.
You can of course install communications and then add the .m files from
the patch to the installation folder. (no need to compile anything)
If you want to contribute you can do as Mike said: clone the current
source and add the files as hg patches.