Hi just starting out on haskell so thought I'd try and install a few packages. from unix-2.3.2.0: $ runhaskell Setup.hs configure checking target system type... i686-pc-cygwin configure: creating ./config.status config.status: creating unix.buildinfo config.status: creating include/HsUnixConfig.h Setup.hs: Missing dependency on a foreign library: * Missing header file: HsUnix.h * Missing C library: dl This problem can usually be solved by installing the system package that provides this library (you may need the "-dev" version). If the library is already installed but in a non-standard location then you can use the flags --extra-include-dirs= and --extra-lib-dirs= to specify where it is. The file is part of the pkg I'm trying to build: $ find . -name HsUnix.h ./include/HsUnix.h I would not expect to have to include $CWD/include normally when building a pkg but even using --extra-include-dirs does not work. I've followed the setup guide here: http://hackage.haskell.org/trac/ghc/wiki/Building/Windows/Cygwin Any help appreciated! Regards, Ben