
This fixes an issue with shells like fish that are not fully POSIX compliant. The syntax `ENV=val cmd' doesn't work properly in there. This issue has been addressed in #45932 and #45945, however it has been recommended to use a single shell (`stdenv.shell' which is either `bash' or `sh') to significantly reduce the maintenance overload in the future. See https://github.com/NixOS/nixpkgs/issues/45897#issuecomment-417923464 Fixes #45897 /cc @FRidh @xaverdh @etu
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