OK. But, wouldn't it be possible for xmobar to use mtl-2.0.1.0 and for parsec to use mtl-2.1.1, while xmobar would use this parsec version? In this case, I am assuming that mtl-2.0.1.0 and mtl-2.1.1 are considered two different libraries. Thanks, José On 06-10-2012 17:17, Yuras Shumovich wrote:
On Sat, 2012-10-06 at 17:02 +0200, José Lopes wrote:
Hello, Hello I'm trying to understand Cabal dependencies. Why does the following situation happen? xmobar-0.15 depends on mtl-2.0.* and needs parsec
All packages that will be broken, depends on parsec. But parsec is compiled with mtl-2.1.1 To install xmobar, cabal needs to reinstall parsec with mtl-2.0.1.0
Thanks, Yuras
# 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: Best regards, José
-- José António Branquinho de Oliveira Lopes Instituto Superior Técnico Technical University of Lisbon