Most systems don’t have the “replace” command, so stdenv shouldn’t rely on it being installed in /usr/bin. Rather it should be built as part of the stdenv bootstrap.

Submitted by Eelco Dolstra on 28 June 2011 at 16:16

Where do you see this dependency slipping through? I don’t have replace on my darwin system but I’ve built stdenv (from stdenv-native to stdenv-nix) fine.