Cabal doesn't echo commands with -v on Windows

Cabal with -v should echo the commands it is executing. But on Windows it doesn't. See the error log below. (This is when compiling the FastPackedString Cabal package, in fact.) Simon M thinks it might be a buffering issue. Flush before calling any command? Simon sh-2.04$ runghc Setup.hs -v build Preprocessing library fps-0.1... Building fps-0.1... <Windows pops up the GHC-has-crashed window>