anchor.diff:  local function mkdir (dir)
   	return exec([[.\bin\bin\mkdir -p "]]..dir..[[" >NUL]])
   end
  +
  +-- does the current user have admin priviledges ( = elevated)
  +local function permission()
  +	return exec("net session >nul 2>&1") -- fails if not admin
  +end
  +
   
   -- interpolate string with values from 'vars' table
   local function S (tmpl)
  
positive.code: 			FORCE = true
  		elseif name == "/R" then
  			REGISTRY = true
  		else
  			die("Unrecognized option: " .. name)
  		end
  
negative.code: local INSTALL_LUA = false
  local USE_MINGW = false
  local REGISTRY = false
  local NOADMIN = false
  
  ---
  -- Some helpers
  