I want to try unicode with haskell, and the Data.Text docs say I need text-icu. This is what I tried: Mac OS X 10.6.8 ~/haskell_programs$ cabal update Downloading the latest package list from hackage.haskell.org ~/haskell_programs$ cabal install text-icu Resolving dependencies... Downloading text-icu-0.6.3.5... Configuring text-icu-0.6.3.5... cabal: Missing dependencies on foreign libraries: * Missing C libraries: icui18n, icudata, icuuc This problem can usually be solved by installing the system packages that provide these libraries (you may need the "-dev" versions). If the libraries are already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where they are. Failed to install text-icu-0.6.3.5 cabal: Error: some packages failed to install: text-icu-0.6.3.5 failed during the configure step. The exception was: ExitFailure 1 I found a post by a Windows user who had the same problem. Do I really need to go out and install those C libraries? Or are they 'misplaced' somewhere on my system? Thanks.