[Haskell-cafe] Why does cabal select base-3.0.3.2 when base-4.2.0.0 is available?

[Bjorn Buckwalter]

Dear all,

Why does cabal seem to prefer base-3.0.3.2 over base-4.2.0.0 when
installing packages with an unqualified base requirement? Example:


$ cabal install -v fad --reinstall
[snip]
Resolving dependencies...
selecting fad-1.0 (hackage)
selecting base-3.0.3.2 (installed) and 4.2.0.0 (installed) and discarding
syb-0.1.0.0, 0.1.0.1, 0.1.0.2, 0.1.0.3, 0.2 and 0.2.1
[snip]
Configuring fad-1.0...
Dependency base ==3.0.3.2: using base-3.0.3.2
[snip]
[1 of 1] Compiling Numeric.FAD      ( Numeric/FAD.hs, dist/build/Numeric/FAD.o )

Numeric/FAD.hs:1:0:
    Warning: Module `Prelude' is deprecated:
               You are using the old package `base' version 3.x.
               Future GHC versions will not support base version 3.x. You
               should update your code to use the new base version 4.x.
[snip]


Thanks,
Bjorn