Hi, On 07/10/2010 05:04 PM, Bryan Murdock wrote:
> The most intriguing feature of nixos for me is being able to have > multiple versions of the same software installed. I just got nixos > running as a virtualbox guest and that's the first thing I tried and > it didn't work. I installed emacs 23: > > nix-env -i emacs-23.2 > > and that worked just fine. Then I tried to install emacs 22: > > nix-env --preserve-installed -i emacs-22.3 > > But I got errors: > > Collission between > '/nix/store/sdfx8jya9ijci7d7xm70fk7wv8zw5z3v-emacs-22.3/bin/b2m' and > '/nix/store/nhkyz3ls880i21319wmr17qyrgzzmn98-emacs-23.2/bin/b2m'. > Suggested solution: use 'nix-env --set-flag priority NUMBER PKGNAME' > to change the priority of one of the conflicting packages. Packages have a numerical priority to resolve conflicts between file names. The default priority is 5, and higher values denote a lower priority. So this will work: $ nix-env -i emacs-22.3 $ nix-env --set-flag priority 10 emacs $ nix-env -i emacs-23.2 You'll now have both Emacs versions in the profile, with Emacs 23.2 as the default. An alternative is to install different versions in different profiles. For example: $ nix-env -p emacs-test -i emacs-23.2 $ ./emacs-test/bin/emacs -- Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/ _______________________________________________ nix-dev mailing list [email protected] https://mail.cs.uu.nl/mailman/listinfo/nix-dev
