Can't install packages with my inplace compiler

[Edward Z. Yang]

Yeah, that's too old; and there's not been a release of a Cabal
which is new enough to do what you want.

Try:

    git clone https://github.com/haskell/cabal
    cd cabal/Cabal
    cabal install
    cd ../cabal-install
    cabal install

Edward

Excerpts from Simon Peyton Jones's message of 2014-11-04 03:59:57 -0800:
> It says 
> 
> simonpj at cam-05-unx:~/tmp/singletons-1.0$ cabal --version
> cabal-install version 1.21.0.0
> using version 1.21.0.0 of the Cabal library
> 
> 
> Oddly if I try "cabal update; cabal install cabal-install" it says:
>     Resolving dependencies...
>     Downloading Cabal-1.20.0.2...
> 
> so it looks as if it's about to install an *older* version than the one I have already!
> 
> What now?
> 
> Thanks
> 
> SImon
> 
> |  -----Original Message-----
> |  From: Herbert Valerio Riedel [mailto:hvriedel at gmail.com]
> |  Sent: 04 November 2014 11:20
> |  To: Simon Peyton Jones
> |  Cc: GHC Devs
> |  Subject: Re: Can't install packages with my inplace compiler
> |  
> |  Hello Simon,
> |  
> |  On 2014-11-04 at 11:55:48 +0100, Simon Peyton Jones wrote:
> |  > When I say
> |  >
> |  > cabal install
> |  > --with-ghc=/home/simonpj/5builds/HEAD-2/inplace/bin/ghc-stage2
> |  >
> |  > I get this
> |  >
> |  > ghc-stage2: ghc no longer supports single-file style package
> |  databases
> |  > (dist/package.conf.inplace) use 'ghc-pkg init' to create the
> |  database
> |  > with the correct format.
> |  >
> |  > Now, this is an old build tree, and I could blow it away entirely,
> |  but
> |  > maybe there is something else going on.  What should I do?
> |  
> |  What does `cabal --version` say? If it doesn't say something like
> |  
> |    $ cabal --version
> |    cabal-install version 1.21.1.0
> |    using version 1.21.1.0 of the Cabal library
> |  
> |  you probably need a newer one (in which case you should build the
> |  `cabal` binary from Git, and to make life easier compile `Cabal` and
> |  `cabal-install` with GHC 7.8.x rather than GHC HEAD)
> |  
> |  Cheers,
> |    hvr