It seem to be fairly new and might not be documented yet. See
https://github.com/NixOS/nix/commit/b64988bb3585478676585a0f0aecbcf4e11d44

On Sat, 1 Aug 2015 at 23:40 Nikolay Amiantov <a...@fmap.me> wrote:

> Ouch, obviously I meant "it should be the opposite of".
>
> On 08/02/2015 01:38 AM, Nikolay Amiantov wrote:
> > Hi all,
> >
> > There is "allowSubstitutes" option which is set for "writeTextFile"
> > derivation and couple of other places. I can't find any documentation on
> > it; from its name it should be similar to "preferLocalBuild". What are
> > the differences?
> >
>
> --
> Nikolay.
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