unsupported optional libraries
Based on the experiences of a user that experienced problems compiling the
BIND man pages with an older version of Sphinx.
There are a number of optional libraries that BIND can be compiled with and it
isn't always clear which versions current BIND releases support.
In so far as the configure script doesn't check the versions of these we might
want to consider adding a note to the ARM, if one does not already exist.
I found the following:
sphinx, json-c, zlib, lmdb, libmaxminddb, libfstrm, libprotobuf-c, libidn2,
readline, libedit
There may be more