Hi devs, just a heads-up (pun intended...) (After updating to TOT, boot and configure with a freshly installed TOT ghc as bootstrap compiler. Then 'make clean'.) Running 'make' gives: ... Creating includes/ghcplatform.h... Done. "rm" -f utils/hsc2hs/dist/build/.depend.haskell.tmp "/home/ggreif/bin/ghc" -M -static -H64m -O0 -fasm -package-db libraries/bootstrapping.conf -hide-all-packages -i -iutils/hsc2hs/. -iutils/hsc2hs/dist/build -iutils/hsc2hs/dist/build/autogen -Iutils/hsc2hs/dist/build -Iutils/hsc2hs/dist/build/autogen -optP-include -optPutils/hsc2hs/dist/build/autogen/cabal_macros.h -package-id base-4.8.2.0 -package-id containers-0.5.6.2 -package-id directory-1.2.2.0 -package-id filepath-1.4.0.0 -package-id process-1.2.3.0 -XHaskell2010 -no-user-package-db -rtsopts -odir utils/hsc2hs/dist/build -hidir utils/hsc2hs/dist/build -stubdir utils/hsc2hs/dist/build -dep-makefile utils/hsc2hs/dist/build/.depend.haskell.tmp -dep-suffix "" -include-pkg-deps utils/hsc2hs/./Main.hs utils/hsc2hs/./C.hs utils/hsc2hs/./Common.hs utils/hsc2hs/./CrossCodegen.hs utils/hsc2hs/./DirectCodegen.hs utils/hsc2hs/./Flags.hs utils/hsc2hs/./HSCParser.hs utils/hsc2hs/./UtilsCodegen.hs <command line>: package db: duplicate packages with incompatible ABIs: binary-0.7.5.0 has ABIs: , c28f822c21e75eb270eca0870e42aaac Cabal-1.23.0.0 has ABIs: , a0a6af8f1dd909f2ee719ddb2cd65779 hpc-0.6.0.2 has ABIs: , 3434375974d4bc6d14952a90ec97d0c4 ghc-boot-0.0.0.0 has ABIs: , f422fc19421064f81c42815f25a11e6e hoopl-3.10.0.2 has ABIs: , 8968e2731ff8d529c37c048d65e94bf2 transformers-0.4.3.0 has ABIs: , 812457c97c58693d7f8a813b1ba19a33 template-haskell-2.11.0.0 has ABIs: , 0ef51476100e9bdf96d1bf59696b98a1 terminfo-0.4.0.1 has ABIs: , aa24f544c0e3614d419e63fa170ac467 The only solution I could come up for now is cd libraries ln -s /home/ggreif/lib/ghc-7.11.20151020/package.conf.d bootstrapping.conf then resuming 'make' leads to success. What could this be? Has somebody seen such an error? Cheers and thanks, Gabor