Total failure

Bad things are happening. I can't build GHC at all! I'm trying 'sh validate -fast' on a clean build of a master checkout HEAD detached at 3a96a0b6db (this is the master checkout from which !2276 branches off) But alas I get this Exit code: 1 Stderr: compiler/main/DynFlags.hs:323:0: error: error: "GHC_STAGE" is not defined, evaluates to 0 [-Werror=undef] #if GHC_STAGE >= 2 | 323 | #if GHC_STAGE >= 2 | ^ compiler/main/DynFlags.hs:5750:0: error: error: "GHC_STAGE" is not defined, evaluates to 0 [-Werror=undef] #if GHC_STAGE < 2 | 5750 | #if GHC_STAGE < 2 | ^ cc1: all warnings being treated as errors What should I do? Simon