The Snow Leopard says: ---------------------- Loading package primitive-0.5.1.0 ... linking ... done. Loading package vector-0.10.9.1 ... <command line>: can't load .so/.DLL for: /Users/benl/devel/ghc/ghc-head-validate/libraries/vector/dist-install/build/libHSvector-0.10.9.1-ghc7.7.20131113.dylib (dlopen(/Users/benl/devel/ghc/ghc-head-validate/libraries/vector/dist-install/build/libHSvector-0.10.9.1-ghc7.7.20131113.dylib, 9): Library not loaded: @rpath/primitive-0.5.1.0/libHSprimitive-0.5.1.0-ghc7.7.20131113.dylib Referenced from: /Users/benl/devel/ghc/ghc-head-validate/libraries/vector/dist-install/build/libHSvector-0.10.9.1-ghc7.7.20131113.dylib Reason: image not found) make[1]: *** [libraries/dph/dph-lifted-copy/dist-install/build/Data/Array/Parallel/PArray/PData.o] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2 The Mountain Lion says: ----------------------- libraries/primitive/cbits/primitive-memops.c:48:0: warning: dereferencing type-punned pointer will break strict-aliasing rules libraries/primitive/cbits/primitive-memops.c: In function ‘hsprimitive_memset_Float’: libraries/primitive/cbits/primitive-memops.c:49:0: warning: dereferencing type-punned pointer will break strict-aliasing rules libraries/primitive/cbits/primitive-memops.c: In function ‘hsprimitive_memset_Double’: libraries/primitive/cbits/primitive-memops.c:50:0: warning: dereferencing type-punned pointer will break strict-aliasing rules make[1]: *** [libraries/primitive/dist-install/build/cbits/primitive-memops.dyn_o] Error 1 make: *** [all] Error 2 Neither seems pleased. Ben.