anchor.diff:    #
     # This must be done in preConfigure because the build process removes
     # helper from the source directory during the build.
  -  preConfigure = ''
  +  preConfigure = lib.optionalString (!stdenv.isDarwin) ''
       mkdir -p $out/sbin
       cp -a mount.unionfs $out/sbin/mount.unionfs-fuse
       substituteInPlace $out/sbin/mount.unionfs-fuse --replace mount.fuse ${fuse}/sbin/mount.fuse
  
positive.code:     description = "FUSE UnionFS implementation";
      homepage = "https://github.com/rpodgorny/unionfs-fuse";
      license = licenses.bsd3;
      platforms = platforms.linux;
      maintainers = with maintainers; [ orivej ];
    };
  }
  
negative.code:     sha256 = "0bwx70x834qgqh53vqp18bhbxbsny80hz922rbgj8k9wj7cbfilm";
    };
  
    patches = [
      # Prevent the unionfs daemon from being killed during
      # shutdown. See
      # http://www.freedesktop.org/wiki/Software/systemd/RootStorageDaemons/
      # for details.
      ./prevent-kill-on-shutdown.patch
    ];
  
    postPatch = lib.optionalString stdenv.isDarwin ''
      substituteInPlace CMakeLists.txt \
        --replace '/usr/local/include/osxfuse/fuse' '${osxfuse}/include/osxfuse/fuse'
      substituteInPlace src/CMakeLists.txt \
        --replace 'target_link_libraries(unionfs fuse pthread)' 'target_link_libraries(unionfs osxfuse pthread)'
    '';
  
    nativeBuildInputs = [ cmake ];
    buildInputs = [ (if stdenv.isDarwin then osxfuse else fuse) ];
  
    # Put the unionfs mount helper in place as mount.unionfs-fuse. This makes it
    # possible to do:
  