module 'free-4.6.1:Main' is defined in multiple files

[Mateusz Kowalczyk]

On 24/03/14 21:26, Mikhail Glushenkov wrote:
> Hi,
> 
> On 24 March 2014 18:54, Mateusz Kowalczyk <fuuzetsu at fuuzetsu.co.uk> wrote:
>>
>> PS: How does one go about downgrading Cabal and cabal-install? If we
>> wanted to check whether cabal is the problem, how?
> 
> You can force the Cabal lib version to use (in case you have multiple
> versions installed) with 'install --cabal-lib-version'. To downgrade
> cabal-install itself to some older version you need to compile and
> install that version.
> 

About cabal-install, I'm mostly concerned about not breaking my whole
existing system by installing an old version. Are there any steps I can
take to retain sane setup? I don't have an OSX machine and I can't
exactly ask people volunteering to break their Haskell environments.

Are there any catches to having multiple Cabal libs installed or will
the latest one always be used if not specified?

-- 
Mateusz K.