Hi After installing the first version of RC2 I ran into the following problem cabal install vector Resolving dependencies... Configuring vector-0.10.9.1... ... [ 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 ... linking ... done. Loading package primitive-0.5.2.1 ... <command line>: can't load .so/.DLL for: libHSprimitive-0.5.2.1.dylib (dlopen(libHSprimitive-0.5.2.1.dylib, 9): image not found) There seems to be a general problem that the install did not produce any dynamic libraries at least on the Mac: ls /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/*/lib /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/cpphs-1.18.2/lib: HScpphs-1.18.2.o Language Text libHScpphs-1.18.2.a libHScpphs-1.18.2_p.a /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/hashable-1.2.1.0/lib: Data HShashable-1.2.1.0.o libHShashable-1.2.1.0.a libHShashable-1.2.1.0_p.a /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/hscolour-1.20.3/lib: HShscolour-1.20.3.o Language libHShscolour-1.20.3.a libHShscolour-1.20.3_p.a /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/primitive-0.5.2.1/lib: Control HSprimitive-0.5.2.1.o libHSprimitive-0.5.2.1.a Data include libHSprimitive-0.5.2.1_p.a /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/syb-0.4.1/lib: Data Generics HSsyb-0.4.1.o libHSsyb-0.4.1.a libHSsyb-0.4.1_p.a /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/text-1.1.0.0/lib: Data HStext-1.1.0.0.o libHStext-1.1.0.0.a libHStext-1.1.0.0_p.a /Users/gcolpitts/Library/Haskell/ghc-7.8.0.20140226/lib/unordered-containers-0.2.3.3/lib: Data libHSunordered-containers-0.2.3.3.a HSunordered-containers-0.2.3.3.o libHSunordered-containers-0.2.3.3_p.a