Hi, recently we've been tweaking our internal build system at Tsuru to handle parallel builds of both cabal packages via 'cabal-sort --makefile' and our local code tree via 'ghc -M'. In addition to the recompilation checker fixes of #5878, the following would be great to have in 7.4.2: 1) http://hackage.haskell.org/trac/ghc/ticket/5891 -- the patch fixes a race condition in creating parent directories for built object files 2) master commit b6f94b5 "Compile link .note section separately from main.c" -- I think this is the patch that fixes link errors we've seen during parallel builds (via ghc -M) with 7.4.1, such as: /x/y/z.o: file not recognized: File truncated and: /usr/bin/ld: BFD (GNU Binutils for Ubuntu) 2.20.51-system.20100908 internal error, aborting at ../../bfd/merge.c line 872 in _bfd_merged_section_offset Will everything currently in master already be included in the next release or is it a separate branch? (If it's a separate branch I'll do some more testing to confirm that b6f94b5 is the patch that fixes the link error). Conrad.