GNUTLS deprecated gnutils_transport_set_lowat function in version 2.12.0
and finally removed it with version 3.0, breaking any packages that
still reference it.
The lowat feature is now disabled permanently I think.
The patch uses the GNUTLS_VERSION_NUMBER macro to appropriately conceal
the function reference. The same patch is widely seen on the 'net with
other packages that use gnutls like OpenVAS.
network security scanner with associated tools like a graphical
user front-end. The core component is a server with a set of network
vulnerability tests (NVTs) to detect security problems in remote
systems and applications.