Re: Guix-devel Digest, Vol 37, Issue 133

[David Craven]

> USE flags a la Gentoo are not compatible with Guix because it means
> that package expressions are no longer self-contained and rely upon
> external global state.  That means that builds are no longer
> deterministic.

Build determinism is only relevant for binary caching so if someone
changes the default USE flags then he's building the packages
him/herself. Using different USE flags also would yield a different
build script so the mapping from .drv => binary would still be
deterministic.