How do I (cross-)build cgminer for AntMiner S1?

The problem I am trying to solve now is poor scalability of S1 + p2pool (the node and the farm located remotely from each other). Stratum connection results in transfering several kilobytes once per ~30s for every S1 unit simultaneously, which increases latency. At the same time, getwork seems to be broken in current cgminer builds for AntS1 (both stock and latest kano's build), so I want to rebuild and debug it.