GHC , haskell-x11, xmonad etc issues.

Hi,
I upgraded ghc yesterday (or the day before, not sure) and when rebuilding xmonad I have some issues.
When upgrading ghc I had this message:
Proceed with installation? [Y/n] y
checking package integrity...
(1/1) checking for file conflicts [##############################################] 100%
==> Unregistering cabalized packages...
==> Done.
(1/1) upgrading ghc [##############################################] 100%
==> All cabalized and yaourt-installed packages need to be reinstalled now.
==> See /usr/share/haskell/ and ghc-pkg list --user for a tentative list of affected packages.
I assume reinstalling them using pacman/yaourt is sufficient. When installing haskell-x11 for instance I have these messages:
Targets (1): haskell-x11-1.4.5-1
Total Download Size: 0.00 MB
Total Installed Size: 3.96 MB
Proceed with installation? [Y/n] y
checking package integrity...
(1/1) checking for file conflicts [##############################################] 100%
ghc-pkg: cannot find package X11-1.4.5
error: scriptlet failed to execute correctly
(1/1) upgrading haskell-x11 [##############################################] 100%
Reading package info from stdin ... done.
X11-1.4.5: dependency base-3.0.3.0 doesn't exist (use --force to override)
error: scriptlet failed to execute correctly
If you like this package, please install aurvote
and vote for its inclusion/keeping in [community]
As a consequence haskell-x11 is not available when recompiling xmonad. I have similar messages for xmonad:
Targets (1): xmonad-0.8.1-1
Total Download Size: 0.00 MB
Total Installed Size: 2.93 MB
Proceed with installation? [Y/n] y
checking package integrity...
(1/1) checking for file conflicts [##############################################] 100%
ghc-pkg: cannot find package xmonad-0.8.1
error: scriptlet failed to execute correctly
(1/1) upgrading xmonad [##############################################] 100%
Reading package info from stdin ... done.
xmonad-0.8.1: dependency X11-1.4.5 doesn't exist (use --force to override)
xmonad-0.8.1: dependency base-3.0.3.0 doesn't exist (use --force to override)
xmonad-0.8.1: dependency containers-0.2.0.0 doesn't exist (use --force to override)
xmonad-0.8.1: dependency directory-1.0.0.2 doesn't exist (use --force to override)
xmonad-0.8.1: dependency process-1.0.1.0 doesn't exist (use --force to override)
xmonad-0.8.1: dependency unix-2.3.1.0 doesn't exist (use --force to override)
error: scriptlet failed to execute correctly
If you like this package, please install aurvote
and vote for its inclusion/keeping in [community]
When I downgrade to ghc in extra and reinstall these packages they work fine, and don't have the above dependency error messages. The only error message I keep having is:
error: scriptlet failed to execute correctly
But this might have been there before. I have no experience in actually using ghc, so maybe I'm missing something?

It's the right idea, but technically not feasible currently. [community] is maintained by a different set of people than [core], [extra] and [testing] (not only that, they are technically implemented differently at the moment, but devs are working on that about now). So only packages from [core] and [extra] can go through [testing] at present. Hence there is always only one version of a package in [community], and naturally it needs to be in sync with [core/extra], not [testing]. So currently it's assumed that people that use testing are technically skilled enough to know (and know how) to rebuild some community packages that need it.

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