For any one else wondering: >The result of package build functions is cached in the file system, in a special directory called the store (see The Store). Each

For any one else wondering: >The result of package build functions is cached in the file system, in a special directory called the store (see The Store). Each package is installed in a directory of its own, in the store—by default under /nix/store. The directory name contains a hash of all the inputs used to build that package; thus, changing an input yields a different directory name. >This approach is the foundation of Guix’s salient features: support for transactional package upgrade and rollback, per-user installation, and garbage collection of packages (see Features). http://www.gnu.org/software/guix/manual/guix.html#Features http://www.gnu.org/software/guix/manual/guix.html#Features