Probleme beim Installieren von Yesod

Ich habe Ghc und Cabal auf meiner Centos 6 installiert. beide scheinen in Ordnung zu sein.

aber wenn ich versuche, yesod mit cabal zu installieren, bekomme ich folgendes:

[root@localhost yesod]# cabal install yesod Resolving dependencies... cabal: cannot configure conduit-0.2.1. It requires base >=4.3 && <5 For the dependency on base >=4.3 && <5 there are these packages: base-4.3.0.0, base-4.3.1.0, base-4.4.0.0, base-4.4.1.0 and base-4.5.0.0. However none of them are available. base-4.3.0.0 was excluded because yesod-auth-0.8.1.1 requires base >=4 && <4.3 base-4.3.0.0 was excluded because yesod-core-0.10.1 requires base >=4 && <4.3 base-4.3.0.0 was excluded because yesod-0.10.1 requires base >=4 && <4.3 base-4.3.0.0 was excluded because of the top level dependency base -any base-4.3.1.0 was excluded because yesod-auth-0.8.1.1 requires base >=4 && <4.3 base-4.3.1.0 was excluded because yesod-core-0.10.1 requires base >=4 && <4.3 base-4.3.1.0 was excluded because yesod-0.10.1 requires base >=4 && <4.3 base-4.3.1.0 was excluded because of the top level dependency base -any base-4.4.0.0 was excluded because yesod-auth-0.8.1.1 requires base >=4 && <4.3 base-4.4.0.0 was excluded because yesod-core-0.10.1 requires base >=4 && <4.3 base-4.4.0.0 was excluded because yesod-0.10.1 requires base >=4 && <4.3 base-4.4.0.0 was excluded because of the top level dependency base -any base-4.4.1.0 was excluded because yesod-auth-0.8.1.1 requires base >=4 && <4.3 base-4.4.1.0 was excluded because yesod-core-0.10.1 requires base >=4 && <4.3 base-4.4.1.0 was excluded because yesod-0.10.1 requires base >=4 && <4.3 base-4.4.1.0 was excluded because of the top level dependency base -any base-4.5.0.0 was excluded because yesod-auth-0.8.1.1 requires base >=4 && <4.3 base-4.5.0.0 was excluded because yesod-core-0.10.1 requires base >=4 && <4.3 base-4.5.0.0 was excluded because yesod-0.10.1 requires base >=4 && <4.3 base-4.5.0.0 was excluded because of the top level dependency base -any 

UPDATE: Ich habe gerade versucht, die haskell-Plattform zu installieren, um zu sehen, ob dies Probleme lösen würde, die scheinbar Abhängigkeiten sind, aber kein Glück. Ich bekomme die gleiche Fehlermeldung, wenn ich rennecabal install Cabal cabal-install yesod