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