Ian In a clean build with validate.mk set thus: GhcStage1HcOpts += -DDEBUG GhcLibHcOpts += -ticky -Wwarn SplitObjs = YES I get the error below on HEAD. Could something be wrong with the build system? I assume it's the SplitObjs=YES. Thanks Simon /usr/bin/find libraries/ghc-prim/dist-install/build/GHC/Classes_o_split libraries/ghc-prim/dist-install/build/GHC/CString_o_split libraries/ghc-prim/dist-install/build/GHC/Debug_o_split libraries/ghc-prim/dist-install/build/GHC/Magic_o_split libraries/ghc-prim/dist-install/build/GHC/PrimopWrappers_o_split libraries/ghc-prim/dist-install/build/GHC/IntWord64_o_split libraries/ghc-prim/dist-install/build/GHC/Tuple_o_split libraries/ghc-prim/dist-install/build/GHC/Types_o_split -name '*.o' -print >> libraries/ghc-prim/dist-install/build/libHSghc-prim-0.3.1.0.a.contents /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/Classes_o_split': No such file or directory /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/CString_o_split': No such file or directory /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/Debug_o_split': No such file or directory /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/Magic_o_split': No such file or directory /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/PrimopWrappers_o_split': No such file or directory /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/IntWord64_o_split': No such file or directory /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/Tuple_o_split': No such file or directory /usr/bin/find: 'libraries/ghc-prim/dist-install/build/GHC/Types_o_split': No such file or directory make[1]: *** [libraries/ghc-prim/dist-install/build/libHSghc-prim-0.3.1.0.a] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2 simonpj@cam-05-unx:~/5builds/HEAD-2$