[Haskell-beginners] cabal errors..

[Gregory Guthrie]

I am (again) running into cabal install issues; which have been all too common for me.

In this case as an example, I tried this:
       C:\Users\haskell>Cabal install buildwrapper
      .....
     buildwrapper-0.6.0 depends on regex-tdfa-1.1.8 which failed to install.
     regex-tdfa-1.1.8 failed during the building phase. The exception was:
     ExitFailure 1

So I tried this:
     C:\Users\haskell>cabal install regex-tdfa
     Resolving dependencies...
     In order, the following would be installed:
     regex-base-0.93.2 (reinstall) changes: array-0.3.0.2 -> 0.4.0.0, base-4.3.1.0
     -> 4.5.0.0, bytestring-0.9.1.10 -> 0.9.2.1, containers-0.4.0.0 -> 0.4.2.1,
     mtl-2.0.1.0 -> 2.1.2
     regex-tdfa-1.1.8 (new package)
     cabal: The following packages are likely to be broken by the reinstalls:
     regex-posix-0.95.1
     regex-compat-0.95.1
     haskell-platform-2011.3.0.0
     regex-posix-0.94.4
     regex-compat-0.93.1
     haskell-platform-2011.2.0.1
     regex-posix-0.95.1
     regex-compat-0.95.1
     haskell-platform-2012.2.0.0
     Use --force-reinstalls if you want to install anyway.

So what to do?
Last time I got into a situation like this I tried to start-over with cabal, remove all local cache and rebuild the library.