AFAICT this is done by stdenv nowadays: bde82098b8/pkgs/development/tools/misc/patchelf/setup-hook.sh (L5) bde82098b8/pkgs/stdenv/generic/setup.sh (L737) Might help /be somehow related to these mysterious errors that seem to occur sometimes (?): http://hydra.nixos.org/build/34131589/nixlog/1/raw
bde82098b8/pkgs/development/tools/misc/patchelf/setup-hook.sh (L5)
bde82098b8/pkgs/stdenv/generic/setup.sh (L737)