Hi Ludovic,

 > I think the probability of an accidental collision between any two
 > store paths (regardless of the ‘stdenv.system’ value) is that of an
 > accidental collision between any two SHA256 hashes of two different
 > inputs.

yes, based on the assumption that the inputs differ, collisions are not
an issue.

The question is: do the inputs differ when the same expression is built
on two different systems, i.e. MacOS X and Linux?

Take care,
Peter

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