Manuel:
IMHO it is nice to have a build infrastructure that people can fall back on if they haven't got anything else, but to prescribe anything won't work.
I strongly agree with this. That's the beauty of Isaac's idea (adapted from python or debian or ...) of putting a script on top of it all. If it's sitting on top of an fptools make system, you use one version of the script; if sitting on top of the gtk+hs build system you use a slightly different version. (In both cases, the script should be fairly trivial because the makefiles do all the work.)
Being a 3rd party library author, I am worried. Gtk+HS, for example, has a quite sophisticated build system. Adapting that to anything else would be quite some work.
This reminds me: can you recommend some make rules for use with c2hs so that I can add them to the fptools infrastructure. -- Alastair