ghc fails to build due to trust issues

[Bas van Dijk]

Hello,

I'm trying to build recent ghc-HEAD using ghc-7.2.1 but get the following error:

libraries/filepath/System/FilePath/Internal.hs:81:1:
    base:Data.List can't be safely imported! The package (base) the
module resides in isn't trusted.

I guess a "-trust base" flag has to be passed to ghc somewhere.

Regards,

Bas