[Haskell-cafe] Why does cabal unnecessarily reinstall dependencies?

[Martijn van Steenbergen]

Hello cafe,

When I want to locally install my own package through "cabal install" it 
tries to reinstall dependencies convertible-1.0.9.1, HDBC-2.2.6.1 and 
HDBC-mysql-0.6.3 even though they are already installed (and work fine). 
Why does it do this?

cabal-install version 0.8.2
using version 1.8.0.2 of the Cabal library
Mac OS Leopard

Thanks,

Martijn.