\directlua{
  kpse.filelist = { }
  local mt = { }
  function mt.__index (t, key)
    return kpse.lookup(key)
  end
  setmetatable(kpse.filelist, mt)

  local os_getenv = os.getenv
  function os.getenv(var)
    if var == "SP_FONT_PATH" then return "" end
    return os_getenv(var)
  end

  local fontloader = require("fontloader.lua")

  function define_font (cs, file, size, props)
    props = props or { }
    size  = size  or 10
    size = 65536 * size
    local success, f = fontloader.define_font(file, size, props)

\directlua{
  kpse.filelist = { }
  local mt = { }
  function mt.__index (t, key)
    return kpse.lookup(key)
  end
  setmetatable(kpse.filelist, mt)

  local os_getenv = os.getenv
  function os.getenv(var)
    if var == "SP_FONT_PATH" then return "" end
    return os_getenv(var)
  end

  local fontloader = require("fontloader.lua")

  callback.register("define_font",
    function (name, size, id)
      return select(2, fontloader.define_font(name, size))
    end)
}
\font\FOO=lmroman10-regular.otf at 10pt

[paulo@cambridge document] $ ack "abnt" thesis.tex
\usepackage[alf]{abntex2cite}
\bibliographystyle{abntex2-alf}

<viro> "scanf is tough" -- programmer Barbie...

	- Al Viro on #kernelnewbies

$ ls -l texput.pdf
-rw-r--r-- 1 davidc Domain Users 3822 Feb  4 22:22 texput.pdf