[Haskell-cafe] Cabal dependencies

[José Lopes]

Hello,

I'm trying to understand Cabal dependencies.
Why does the following situation happen?

# cabal install xmobar --dry-run
Resolving dependencies...
In order, the following would be installed:
parsec-3.1.3 (reinstall) changes: mtl-2.1.1 -> 2.0.1.0
xmobar-0.15 (new package)
Warning: The following packages are likely to be broken by the reinstalls:
texmath-0.6.1.1
regex-tdfa-1.1.8
Unixutils-1.50
network-2.4.0.1
HTTP-4000.2.5
network-2.3.0.14
sendfile-0.7.6
happstack-server-7.0.7
happstack-hsp-7.1.0
happstack-7.0.0
hslogger-1.1.5
citeproc-hs-0.3.4
acid-state-0.6.4
HTTP-4000.2.3
ltk-0.12.1.0
json-0.5
highlighting-kate-0.5.1
Use --force-reinstalls if you want to install anyway.

Best regards,
José

-- 
José António Branquinho de Oliveira Lopes
Instituto Superior Técnico
Technical University of Lisbon