See the copyright information in the file named COPYRIGHT.
Helpful links:
https://github.com/redis/hiredis https://github.com/agladysh/lua-hiredis
Prebuilt libhiredis.so is bundled for your convenience in bin/hiredis/.
Put it to some place that ffi.load("hiredis") knows about.
Sorry, no further docs on this point. Read the source
(start with test/test.lua).
See also the TODO file.