If you install over an older version of ghc, you will have a leftover package cache from the old version which will cause package lookups to fail. Someone else just tripped over this in IRC after installing a new ghc over an old one; the Arch 8.2.2 upgrade from 8.2.1 also seems to be susceptible to this. Rebuilding the package cache (ghc-pkg recache --global; with sudo if installed as root) will fix this.

On Sat, Dec 30, 2017 at 9:13 AM, Fabien R <theedge456@free.fr> wrote:

On 20/12/17 21:48, Ben Gamari wrote:
>
> The GHC development team is pleased to announce the first alpha release
> of the 8.4.1 release. The usual release artifacts are available from
>
> https://downloads.haskell.org/~ghc/8.4.1-alpha1

I tried to build the release from this script [1] which works
straightfully for GHC 8.2.2 on debian jessie.
1) There's a minor glitch showing:
GHC_VERSION = 8.4.1
but the version of the file in the download area is 8.4.0.20171214

2) GHC and cabal library installed successfully whereas cabal-install
failed with this error:

Linking Setup ...
Configuring HTTP-4000.3.7...
Setup: Encountered missing dependencies:
base >=4.3.0.0 && <4.11

Error during cabal-install bootstrap:
Configuring the HTTP package failed.

Any hint ?

--
Fabien

[1] gist.github.com/yantonov/10083524

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