Make json recipe builtin starting from Emacs 23

I'm making a recipe that depends on the json package but even if it is builtin in my Emacs el-get installed another version. JSON is a builtin package since Emacs 23 I believe. At least it is on Emacs 23.4.1 on my Debian and the website http://edward.oconnor.cx/2006/03/json.el says it is included Emacs since February 2008, Emacs 23 was released in 2009.