Arch Linux/Preferred Package Tools
Haskell packages in Arch Linux, as stated by the Arch Haskell Arch Linux/Policy, use "provides" syntax in PKGBUILDs.
Sadly, one of the most famous package builder tools does not support this metadata, and is thus entirely broken with Haskell packages as of Jan 2010.
Instead of yaourt, we recommend the following tools:
sudo bauerbill --no-color --aur -S haskell-csv