I think my tree is up to date but I’m getting this. Any ideas? simon "inplace/bin/ghc-stage1" -hisuf hi -osuf o -hcsuf hc -static -H32m -O -Werror -Wall -H64m -O0 -package-name xhtml-3000.2.1 -hide-all-packages -i -ilibraries/xhtml/. -ilibraries/xhtml/dist-install/build -ilibraries/xhtml/dist-install/build/autogen -Ilibraries/xhtml/dist-install/build -Ilibraries/xhtml/dist-install/build/autogen -Ilibraries/xhtml/. -optP-include -optPlibraries/xhtml/dist-install/build/autogen/cabal_macros.h -package base-4.7.0.0 -Wall -XHaskell98 -XCPP -O2 -O -dcore-lint -fno-warn-amp -fno-warn-deprecated-flags -Wwarn -ticky -no-user-package-db -rtsopts -odir libraries/xhtml/dist-install/build -hidir libraries/xhtml/dist-install/build -stubdir libraries/xhtml/dist-install/build -split-objs -dynamic-too -c libraries/xhtml/./Text/XHtml/Frameset/Elements.hs -o libraries/xhtml/dist-install/build/Text/XHtml/Frameset/Elements.o -dyno libraries/xhtml/dist-install/build/Text/XHtml/Frameset/Elements.dyn_o "inplace/bin/ghc-stage1" -hisuf dyn_hi -osuf dyn_o -hcsuf dyn_hc -fPIC -dynamic -H32m -O -Werror -Wall -H64m -O0 -hide-all-packages -i -iutils/hsc2hs/. -iutils/hsc2hs/dist-install/build -iutils/hsc2hs/dist-install/build/autogen -Iutils/hsc2hs/dist-install/build -Iutils/hsc2hs/dist-install/build/autogen -optP-include -optPutils/hsc2hs/dist-install/build/autogen/cabal_macros.h -package base-4.7.0.0 -package containers-0.5.3.1 -package directory-1.2.0.1 -package filepath-1.3.0.2 -package process-1.2.0.0 -XHaskell98 -XCPP -XForeignFunctionInterface -no-user-package-db -rtsopts -odir utils/hsc2hs/dist-install/build -hidir utils/hsc2hs/dist-install/build -stubdir utils/hsc2hs/dist-install/build -c utils/hsc2hs/./HSCParser.hs -o utils/hsc2hs/dist-install/build/HSCParser.dyn_o utils/hsc2hs/HSCParser.hs:24:10: Warning: ‛Parser’ is an instance of Monad but not Applicative - this will become an error in GHC 7.10, under the Applicative-Monad Proposal. utils/hsc2hs/HSCParser.hs:36:10: Warning: ‛Parser’ is an instance of MonadPlus but not Alternative - this will become an error in GHC 7.10, under the Applicative-Monad Proposal. <no location info>: Failing due to -Werror. make[1]: *** [utils/hsc2hs/dist-install/build/HSCParser.dyn_o] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2 simonpj@cam-05-unx:~/5builds/HEAD$ Microsoft Research Limited (company number 03369488) is registered in England and Wales Registered office is at 21 Station Road, Cambridge, CB1 2FB