Does anybody know the current status and availability of this?
If it appears to be a "dead" project then I am very very tempted to start a moden clean-room implementation of my own and see how it works out. I am learning Prolog *again* and I want to be able to talk to MySQL for lots of reasons.
I am also planning (time, such precious little time...) on some kind of HTTP interface too, maybe using cURL or something as that would just be plain FFI into libcurl which means that things like ElasticSearch, MongoDB et al. would be opened up i.e. anything that works over HTTP.