Luatex is always (till now) compiled with lua 5.2 since they use an adapter version. No need to check anything, you know you will get 5.2. -- PREINING Norbert + TeX Live & Debian Developer + http://www.preining.info GPG: 0x860CDC13 fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13