(Sorry for the delay, I wanted to be sure that building phase was over) ============================================================== LuaTeX 1.17.0 2023-04-29 ============================================================== - A breaking backward compatibility change: by default the socket library is not enabled . The new option --socket enable the socket library as before, as also --shell-escape (without --shell-restricted); --nosocket, --no-socket , --safer disabled the library, and they have the priority in case of conflicting options. The mime library is always available; socket.sleep and socket.gettime are duplicated as os.socketsleep and os.socketgettime, both always available. The new os.kpsepopen replace io.popopen in kpse mode (i.e. when kpse_init is not zero) as it was before but the permission now cannot be changed anymore with kpse.check_permission . The function os.kpsepopen follows the same restrictions as io.popen . Thanks to Max Chernoff for debugging. --luigi