Hi, Time is an important library, it got unbundled from GHC, and it seems Windows users can't install the time package! C:\Neil\hoogle>cabal install time --global Resolving dependencies... [1 of 1] Compiling Main ( C:\Users\Neil\AppData\Local\Temp\time-1.1. 2.32884\time-1.1.2.3\Setup.hs, C:\Users\Neil\AppData\Local\Temp\time-1.1.2.32884 \time-1.1.2.3\dist\setup\Main.o ) Linking C:\Users\Neil\AppData\Local\Temp\time-1.1.2.32884\time-1.1.2.3\dist\setu p\setup.exe ... Configuring time-1.1.2.3... setup.exe: sh: runGenProcess: does not exist (No such file or directory) cabal: Error: some packages failed to install: time-1.1.2.3 failed during the configure step. The exception was: exit: ExitFailure 1 C:\Neil\hoogle>ghc --version The Glorious Glasgow Haskell Compilation System, version 6.10.2 My guess is that it would work if I installed mingw, but that it hasn't been tested without. I consider this problem fatally serious - we may have managed to make GHC 6.10.2 unuseable for many Windows users... Thanks Neil