On Wednesday 30 January 2013, 22:29:23, Arnaud Bailly wrote:

YakGraph.hs:13:30:
    Couldn't match expected type `Data.Text.Lazy.Internal.Text'
                with actual type `text-0.11.2.0:Data.Text.Lazy.Internal.Text'

one package (at least) you use - probably graphviz - was compiled with a version of `text` that is not the newest you have installed.

GHC selects the newest installed version of a package by default, cabal and cabal-dev select the version that the other used packages require.

Add a -package text-0.11.2.0 flag to the command line.