I like the fact that `make -O` gives me output that's always meaningful, but it's sometimes annoying how it's sitting idly while a command is spewing output. To some extent it's unavoidable, but I wonder if we could reduce the inconvenience by making such that Make emits the subprocess's output without delay *if* that's the only subprocess active (i.e. we're not waiting to see which process ends first before emitting its output).
Stefan
