anchor.diff:  
       cp -r schema $data_outputdir
     '';
  -}
  +}).overrideAttrs (_oldAttrs: attrOverrides)
  
positive.code:     databrary_datadir=. dist/build/databrary/databrary -w
    '';
    postInstall = '' 
      export dontPatchELF=1
    '';
    postFixup = ''
      data_basedir="$out/share/x86_64-linux-ghc-8.0.2"
  
negative.code:     cat databrary.conf
      ls -la $(dirname $socket_path)
      ls -la $socket_path
    '';
    postBuild = ''
      kill -INT `head -1 $socket_path/postmaster.pid`
  