I read an interesting thread about some work being done to package a svn
version of gnunet in Guix

It's here
http://lists.gnu.org/archive/html/guix-devel/2016-03/msg00464.html

How did it end ? I see no gnunet-svn among the packages.

I'd love to play with gnunet

There was a fix on the description to be done
http://lists.gnu.org/archive/html/guix-devel/2016-03/msg01409.html

There was a test on python-zbar (and qrcodes ?)
http://lists.gnu.org/archive/html/guix-devel/2016-03/msg01366.html

There was a typo to fix
http://lists.gnu.org/archive/html/guix-devel/2016-03/msg01358.html