[Nix-dev] Extend wrapper created with makeWrapper

[José Luis Lafuente]

Hi,

I want to override an existing package to use it locally. I would like to
just set an environment variable before the program is executed, but the
derivation is using `wrapProgram`, so there is already a wrapper for the
program. Is possible to override the derivation to add another environment
variable to the wrapper? The derivation I want to modify is okular (
https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/kde/okular.nix
)

Thanks in advance,
José Luis
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