[GHC] #9663: Windows build process should give better message if you forgot to clone tarballs

[GHC]

#9663: Windows build process should give better message if you forgot to clone
tarballs
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       Reporter:  ezyang             |                   Owner:
           Type:  bug                |                  Status:  new
       Priority:  normal             |               Milestone:
      Component:  Build System       |                 Version:  7.9
       Keywords:                     |        Operating System:  Windows
   Architecture:  Unknown/Multiple   |         Type of failure:
     Difficulty:  Unknown            |  None/Unknown
     Blocked By:                     |               Test Case:
Related Tickets:                     |                Blocking:
                                     |  Differential Revisions:
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 If you forget to clone ghc-tarballs into the directory when building on
 Windows, configure will report that it can't find a working C compiler. It
 would be nice if there was a better error message here.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9663>
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