anchor.diff:  -- ***********************************************************
   local function look_for_interpreter (directory)
   	if vars.LUA_BINDIR then
  +        -- if LUA_BINDIR is specified, it must be there, otherwise we fail
   		if exists( S"$LUA_BINDIR\\lua$LUA_VERSION.exe" ) then
   			vars.LUA_INTERPRETER = S"lua$LUA_VERSION.exe"
   			print(S"       Found $LUA_BINDIR\\$LUA_INTERPRETER")
  
positive.code: 
  local function look_for_lua_install ()
  	print("Looking for Lua interpreter")
  	local directories = { [[c:\lua5.1.2]], [[c:\lua]], [[c:\kepler\1.1]] }
  	if vars.LUA_PREFIX then
  		table.insert(directories, 1, vars.LUA_PREFIX)
  	end
  	if vars.LUA_BINDIR and vars.LUA_LIBDIR and vars.LUA_INCDIR then
  		if look_for_interpreter(vars.LUA_BINDIR) and 
  
negative.code: vars.INCDIR = S"$FULL_PREFIX\\include"
  vars.LUA_SHORTV = vars.LUA_VERSION:gsub("%.", "")
  
  if INSTALL_LUA then
  	if vars.LUA_VERSION ~= "5.1" then
  		die("Cannot install own copy because no 5.2 version is bundled")
  	end
  	vars.LUA_INTERPRETER = "lua5.1"
  	vars.LUA_BINDIR = vars.BINDIR
  	vars.LUA_LIBDIR = vars.LIBDIR
  