Compiling haskell-src-exts with -prof

One of the packages that I use depends on Language.Haskell.Hsx from haskell-src-exts. I want to profile my code, so I need to compile Language.Haskell.Hsx for profiling. I tried to figure out how to compile haskell-src-exts with -prof, but so far I could not. Can anyone point me in the right direction? I am building on Windows with GHC 6.4, if that matters. Thanks Cyril