In order to document this on the page for #929131 : Work on packaging gnunet 0.11.6 was done (and is almost concluded) on salsa[1], and no compilation problems exist anymore. I actually concluded the 0.11.6 work[2], but the changes are minimal and I didn't think at the time that it would be useful to submit those patches.
In the meantime, GNUnet is already at 0.11.8[3]. [1] https://salsa.debian.org/debian/gnunet [2] https://github.com/marado/debian-gnunet [3] https://gnunet.org/en/news/2019-0.11.8.html Best regards, -- Marcos Marado