Hello Cafè, this is what I'm getting: ╰─$ cabal install vector-0.10.9.1 1 ↵ Resolving dependencies... Configuring vector-0.10.9.1... Building vector-0.10.9.1... Preprocessing library vector-0.10.9.1... [ 1 of 19] Compiling Data.Vector.Storable.Internal ( Data/Vector/Storable/Internal.hs, dist/build/Data/Vector/Storable/Internal.o ) [ 2 of 19] Compiling Data.Vector.Fusion.Util ( Data/Vector/Fusion/Util.hs, dist/build/Data/Vector/Fusion/Util.o ) [ 3 of 19] Compiling Data.Vector.Fusion.Stream.Size ( Data/Vector/Fusion/Stream/Size.hs, dist/build/Data/Vector/Fusion/Stream/Size.o ) Data/Vector/Fusion/Stream/Size.hs:25:10: Warning: No explicit method or default declaration for `*' In the instance declaration for `Num Size' Data/Vector/Fusion/Stream/Size.hs:25:10: Warning: No explicit method or default declaration for `abs' In the instance declaration for `Num Size' Data/Vector/Fusion/Stream/Size.hs:25:10: Warning: No explicit method or default declaration for `signum' In the instance declaration for `Num Size' [ 4 of 19] Compiling Data.Vector.Internal.Check ( Data/Vector/Internal/Check.hs, dist/build/Data/Vector/Internal/Check.o ) [ 5 of 19] Compiling Data.Vector.Fusion.Stream.Monadic ( Data/Vector/Fusion/Stream/Monadic.hs, dist/build/Data/Vector/Fusion/Stream/Monadic.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... <command line>: can't load .so/.DLL for: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libiconv.dylib (dlopen(/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libiconv.dylib, 9): no suitable image found. Did find: /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk/usr/lib/libiconv.dylib: mach-o, but wrong filetype) Failed to install vector-0.10.9.1 cabal: Error: some packages failed to install: vector-0.10.9.1 failed during the building phase. The exception was: ExitFailure 1 I've did the trick of installing gcc-4.8 as described here: http://cp.reddit.com/r/haskell/comments/1ozukp/anyone_running_ghc_763_on_osx... I'm running a compiled version of ghc 7.6.3 (so not installed via the Haskell platform). Have anyone stumbled upon this? Thanks, Alfredo