[darcs-users] compiling darcs with ghc-6.4 failed

[Andres Loeh]

> The proper way to 'unmask' a package is to add a line to a file  
> /etc/portage/package.unmask:
> 
>    dev-lang/ghc
> 
> (without spaces at the beginning).  This way the mask will persist through  
> emerge syncs.

Although this is quickly getting off-topic, I would like to warn
you not to unmask packages "globally", but rather unmask specific
versions, such as

=dev-lang/ghc-6.4

in this situation. Otherwise, you might later accidentally update to
a package version which is really broken ...

Cheers,
  Andres