So! Commit 834129e changes the default store directory to /gnu/store. Again, if you don’t plan to change right now, make sure to configure with --with-store-dir=/nix/store next time!
The other change is commit f5768af, which changes the place where the store’s database and build logs are stored. If you don’t plan to switch to /gnu/store right now, then do something like: cd $localstatedir && ln -s nix guix cd $localstatedir/log && ln -s nix guix If you do plan to switch to /gnu/store now, then just run ./configure and forget about the rest. Ludo’.