[[!comment format=mdwn
 username="http://joeyh.name/"
 ip="209.250.56.163"
 subject="comment 17"
 date="2014-02-08T21:23:02Z"
 content="""
Blow away ~/.ghc and ~/.cabal; cabal update; put `library-profiling: True` in ~/.cabal/config; and reinstall everything.

Note that you may need to first build ghc's own bundled libraries with profiling support, if your ghc installation does not already include them. I don't know how to do that since on debian I can just `apt-get install ghc-prof`. If that's needed, ghc will tell you and refuse to build stuff with profiling.
"""]]