libchip question

[Till Straumann]

Hi.

I have a driver (for the Tundra Universe VME-PCI bridge) which
I'd like to contribute to libchip, so different BSPs can use it.

However, not all BSPs offer the necessary subsystems
(essentially IRQ and PCI services) needed by my vmeUniverse.c

How can I tell a libchip's (subdir) Makefile.am it should 
include/exclude files
from the build based on the BSP that is being built?

regards

-- Till.