[NTG-context] find file in beta

Using: the minimals beta distribution. I have added a new map-file for the inclusion of pfb font files in the texmf-local tree: --/fonts/map/pdf/, where the other maps reside. But luatex seems not to find it: luatools --find-file reports nothing. The file however is fine, because if I add it to the directory where the file being TeX-ed is, then it is found indeed. I did things like luatools --generate, mktexlsr, but this did not help. Obviously I am missing the point. Where? Hans van der Meer