Determining GHC version use to compile an executable?

I was wondering if there was a clever way to determine the GHC version that was used to compile a particular executable. I looked in the RTS flags and didn't see anything obvious, but I was wondering if I missed something or if there was a clever back door. It's not a big deal if there isn't but, if there is, it might help me diagnose a problem. Thanks, - Ravi