Typo in build-system, and why about threading on ppc

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"type=relase/normal/debug (default=normal) Enables debug information, or
compiles with optimizations."

"relase" --> "release"? (Is this just a bug in the message or is it
actually called the typo'd thing)

Also
"threads=0 (default=1, except on ppc where the default is 0) Disables
threading"
I suppose this is related to the result
"Checking for pthread_create() in C library pthread... no"
?
What's special about ppc here? does it cause trouble somehow?

Isaac

P.S. I'm looking at this is because I'm actually trying to use Yhc for
something now (hopefully it'll work this time...).  This time I'm
thinking that it might be the right compromise between compile-time and
run-time for checking my numerous QuickCheck properties (ghc takes ages
to compile, and hugs takes ages to run, where ages are about half a
minute on my machine ^_^).
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