xgqt@gentoo.org Maciej Barć N-Prolog(NPL) is an interpreter and compiler to be compatible with Arity/Prolog32. N-Prolog is NOT ISO-Prolog. About Arity/prolog32 see http://petergabel.info/ArityProlog32/ArityProlog32PredList/ https://github.com/sasagawa888/nprolog/issues sasagawa888/nprolog