Nit with 6.2.1

Hi,

I built 6.2.1 on Mac OS X 10.3.3 from source with OpenGL support.

I built the Cube.hs demo program and it compiles and runs fine, but if I
terminate it with crtl-C instead of hitting "q" in the OpenGL window, I 
get
the error message

> ./Cube
^CCube: internal error: unblockThread
    Please report this as a bug to glasgow-haskell-bugs@xxxxxxxxxxx,
    or http://www.sourceforge.net/projects/ghc/

(Hitting "q" in the OpenGL display window causes graceful termination.)

Perhaps the error message is simply overly enthusiastic. Or maybe there
is something wrong.

Best Wishes,
Greg

Gregory Wright
Antiope Associates LLC
gwright@xxxxxxxxxxx