[webkit-help] Nitro vs Nitro Extreme: which builds at the JSC tip?

[Jozwiak, John]

Naive question that I've tried to answer though feel I haven't:
how does one know when JSC is using Nitro Extreme, Nitro, or just Squirrelfish?

I built just JSC using Ariya's advice on Linux (thanks, Ariya):

 (installed the Qt prereqs)
 qmake jsc.pro
 make

and can subsequently run Sunspider on the jsc executable, but what IS that executable?

Any wisdom appreciated in advance,
John