Hi, usually I install haskeline without terminfo, because I don't miss any functionality and try to avoid installing unused packages. I do so either manually (and global) via Setup or by: cabal install -f -terminfo haskeline However, when I install another package that depends on haskeline (i.e. "cabal install pugs") it will reinstall terminfo and haskeline. It does not reinstall haskeline if I manually install terminfo by "cabal install terminfo", although my old (global) haskeline package does not depend on the new (local) terminfo package. 1. What do I gain when I use haskeline with terminfo? 2. How can I convince "cabal install <pkg-depending-on-haskeline>" to use my installed haskeline version without terminfo? Where is more documentation for the flags? --constraint=DEPENDENCY A list of additional constraints on the dependencies. --preference=DEPENDENCY Specify preferences (soft constraints) on the version of a package Cheers Christian cabal-install version 0.8.2 using version 1.8.0.6 of the Cabal library