Prolog is available, at least in two versions (GNU Prolog and SWI-Prolog) in the OpenBSD ports tree:
lang/gprolog
lang/swi-prolog
and more than likely other BSD's.
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dc -e '[q]sa[ln0=aln256%Pln256/snlbx]sb12247225403800449909543746snlbxq'
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