In cmd.exe
,
> set CABAL="D:\Program Files (x86)\Haskell Platform\2013.2.0.0\lib\extralibs\bin"
> cd %CABAL%
> cabal install hakyll
cabal: The program ghc version >=6.4 is required but it could not be found.
That didn't make sense as the Haskell Platform on this computer was newly installed: