On 2011 May 24, at 09:28, Andres Loeh wrote:
Hi.
Could anyone shed light on the meaning of this error message?
cabal: cannot configure xmonad-0.9.1 It requires base ==3.*
For the dependency on base ==3.* there are these packages:
base-3.0.3.1 and
base-3.0.3.2. However none of them are available.
base-3.0.3.1 was excluded because of the top level dependency base -
any
base-3.0.3.2 was excluded because of the top level dependency base -
any
It's not a great error message. Yes, xmonad-0.9.1 requires base ==3.*.
So far, so good. Now, base is a special package. It comes with ghc,
and cannot be upgraded. That's why Cabal will rule out all base
versions but the one you already have installed. If you have a recent
ghc, that'll be base-4.
So Cabal is correct to fail in this case: you cannot install this
version of xmonad with this version of ghc.
That makes sense. Thanks your the explanation.
So would it be correct to infer that the -any restriction will only
(and always) come into play with special packages such as base?
Are there any other special packages besides base?
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