Windows validation is failing (again). Error is below. This is a clean build. Ian? This is the same problem I had before on Linux, but this time my libraries are up to date. Did you validate on windows? Iconv may be different on windows. Urk Simon "inplace/bin/ghc-stage1.exe" -hisuf hi -osuf o -hcsuf hc -static -H32m -O -Werror -Wall -H64m -O0 -package-name base-4.7.0.0 -hide-all-packages -i -ilibraries/base/. -ilibraries/base/dist-install/build -ilibraries/base/dist-install/build/autogen -Ilibraries/base/dist-install/build -Ilibraries/base/dist-install/build/autogen -Ilibraries/base/include -optP-DOPTIMISE_INTEGER_GCD_LCM -optP-include -optPlibraries/base/dist-install/build/autogen/cabal_macros.h -package ghc-prim-0.3.1.0 -package integer-gmp-0.5.1.0 -package rts-1.0 -package-name base -XHaskell98 -XCPP -O2 -O -dcore-lint -fno-warn-deprecated-flags -no-user-package-db -rtsopts -odir libraries/base/dist-install/build -hidir libraries/base/dist-install/build -stubdir libraries/base/dist-install/build -c libraries/base/./GHC/IO/Encoding/Iconv.hs -o libraries/base/dist-install/build/GHC/IO/Encoding/Iconv.o Top level: Failed to load interface for `GHC.Integer.Type' There are files missing in the `integer-gmp' package, try running 'ghc-pkg check'. Use -v to see a list of the files searched for. make[1]: *** [libraries/base/dist-install/build/GHC/IO/Encoding/Iconv.o] Error 1 make[1]: *** Waiting for unfinished jobs.... make: *** [all] Error 2