[Haskell-cafe] How to install haddock with ghc-7.2.1?

[Paulo Pocinho]

Hi list. Installing haddock fails with ghc-7.2.1.
How do I get to install it along with all dependencies?

C:\>cabal install haddock
Resolving dependencies...
Downloading ghc-paths-0.1.0.8...
[1 of 1] Compiling Main             (
C:\Users\user\AppData\Local\Temp\ghc-paths-0.1.0.86336\ghc-pths-0.1.0.8\Setup.hs,
C:\Users\user\AppData\Local\Temp\ghc-paths-0.1.0.86336\ghc-paths-0.1.0.8\dis
\setup\Main.o )
Linking C:\Users\user\AppData\Local\Temp\ghc-paths-0.1.0.86336\ghc-paths-0.1.0.8\dist\setup\setup.exe
...
Configuring ghc-paths-0.1.0.8...
Building ghc-paths-0.1.0.8...
Preprocessing library ghc-paths-0.1.0.8...
[1 of 1] Compiling GHC.Paths        ( GHC\Paths.hs, dist\build\GHC\Paths.o )
Registering ghc-paths-0.1.0.8...
Installing library in
C:\Users\user\AppData\Roaming\cabal\ghc-paths-0.1.0.8\ghc-7.2.1
Registering ghc-paths-0.1.0.8...
Downloading xhtml-3000.2.0.4...
Configuring xhtml-3000.2.0.4...
Preprocessing library xhtml-3000.2.0.4...
Building xhtml-3000.2.0.4...
[ 1 of 15] Compiling Text.XHtml.BlockTable ( Text\XHtml\BlockTable.hs,
dist\build\Text\XHtml\BlockTable.o )

Implicit import declaration:
    base:Prelude can't be safely imported! The package (base) the
module resides in isn't trusted.
cabal: Error: some packages failed to install:
haddock-2.9.4 depends on xhtml-3000.2.0.4 which failed to install.
xhtml-3000.2.0.4 failed during the building phase. The exception was:
ExitFailure 1