Hi, today I tried to build head with head on os x. The result was: Linking utils/ghc-cabal/dist/build/tmp/ghc-cabal ... "touch" utils/ghc-cabal/dist/build/tmp/ghc-cabal "cp" utils/ghc-cabal/dist/build/tmp/ghc-cabal inplace/bin/ghc-cabal "inplace/bin/ghc-cabal" configure libraries/binary dist-boot "" --with-ghc="/usr/local/bin/ghc" --with-ghc-pkg="/usr/local/bin/ghc-pkg" --package-db=/Users/angerman/code/ghc/libraries/bootstrapping.conf --disable-library-for-ghci --enable-library-vanilla --disable-library-profiling --disable-shared --configure-option=CFLAGS=" -m64 -fno-stack-protector " --configure-option=LDFLAGS=" -m64 " --configure-option=CPPFLAGS=" -m64 " --gcc-options=" -m64 -fno-stack-protector -m64 " --constraint "binary == 0.7.1.0" --constraint "Cabal == 1.21.1.0" --constraint "hpc == 0.6.0.2" --constraint "bin-package-db == 0.0.0.0" --constraint "hoopl == 3.10.0.2" --constraint "transformers == 0.4.1.0" --constraint "terminfo == 0.4.0.0" --with-gcc="/usr/bin/gcc" --configure-option=--with-cc="/usr/bin/gcc" --with-ar="/usr/bin/ar" --with-alex="/Users/angerman/.cabal/bin/alex" --with-happy="/Users/angerman/.cabal/bin/happy" "inplace/bin/ghc-cabal" configure utils/hsc2hs dist "" --with-ghc="/usr/local/bin/ghc" --with-ghc-pkg="/usr/local/bin/ghc-pkg" --package-db=/Users/angerman/code/ghc/libraries/bootstrapping.conf --disable-library-for-ghci --disable-library-vanilla --disable-library-profiling --disable-shared --configure-option=CFLAGS=" -m64 -fno-stack-protector " --configure-option=LDFLAGS=" -m64 " --configure-option=CPPFLAGS=" -m64 " --gcc-options=" -m64 -fno-stack-protector -m64 " --constraint "binary == 0.7.1.0" --constraint "Cabal == 1.21.1.0" --constraint "hpc == 0.6.0.2" --constraint "bin-package-db == 0.0.0.0" --constraint "hoopl == 3.10.0.2" --constraint "transformers == 0.4.1.0" --constraint "terminfo == 0.4.0.0" --with-gcc="/usr/bin/gcc" --configure-option=--with-cc="/usr/bin/gcc" --with-ar="/usr/bin/ar" --with-alex="/Users/angerman/.cabal/bin/alex" --with-happy="/Users/angerman/.cabal/bin/happy" Configuring hsc2hs-0.67... Configuring binary-0.7.1.0... ghc-cabal: '/usr/local/bin/ghc-pkg' exited with an error: ghc-pkg: ghc no longer supports single-file style package databases (/Users/angerman/code/ghc/libraries/bootstrapping.conf) use 'ghc-pkg init' to create the database with the correct format. make[1]: *** [utils/hsc2hs/dist/package-data.mk] Error 1 make[1]: *** Waiting for unfinished jobs.... ghc-cabal: '/usr/local/bin/ghc-pkg' exited with an error: ghc-pkg: ghc no longer supports single-file style package databases (/Users/angerman/code/ghc/libraries/bootstrapping.conf) use 'ghc-pkg init' to create the database with the correct format. make[1]: *** [libraries/binary/dist-boot/package-data.mk] Error 1 Does anyone know what needs to be done to make this work? Best, Moritz