> If you really need to know the number of processors on a system, you could > always compile a sub-program during compile-time and invoke it.
Indeed I assumed that. But I have no idea how to do it in detail in a user friendly way -- so that user can still do a plain "nimble install myTool". Note that this is not limited to number of CPUs, we may be interested in available ram, GL version, GPU and much more at compile time.