lix/doc/manual/src/release-notes/rl-0.6.md

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# Release 0.6 (2004-11-14)
- Rewrite of the normalisation engine.
- Multiple builds can now be performed in parallel (option `-j`).
- Distributed builds. Nix can now call a shell script to forward
builds to Nix installations on remote machines, which may or may
not be of the same platform type.
- Option `--fallback` allows recovery from broken substitutes.
- Option `--keep-going` causes building of other (unaffected)
derivations to continue if one failed.
- Improvements to the garbage collector (i.e., it should actually work
now).
- Setuid Nix installations allow a Nix store to be shared among
multiple users.
- Substitute registration is much faster now.
- A utility `nix-build` to build a Nix expression and create a symlink
to the result int the current directory; useful for testing Nix
derivations.
- Manual updates.
- `nix-env` changes:
- Derivations for other platforms are filtered out (which can be
overridden using `--system-filter`).
- `--install` by default now uninstall previous derivations with
the same name.
- `--upgrade` allows upgrading to a specific version.
- New operation `--delete-generations` to remove profile
generations (necessary for effective garbage collection).
- Nicer output (sorted, columnised).
- More sensible verbosity levels all around (builder output is now
shown always, unless `-Q` is given).
- Nix expression language changes:
- New language construct: `with
E1;
E2` brings all attributes defined in the attribute set *E1* in
scope in *E2*.
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- Added a `map` function.
- Various new operators (e.g., string concatenation).
- Expression evaluation is much faster.
- An Emacs mode for editing Nix expressions (with syntax highlighting
and indentation) has been added.
- Many bug fixes.