I was also wondering, would this work:
```nix
self: super:
let
  sources = import ../nix/sources.nix;
  libPath = with super; lib.concatStringsSep ":" [
    "${lib.getLib libgccjit}/lib/gcc/${stdenv.targetPlatform.config}/${libgccjit.version}"
    "${lib.getLib stdenv.cc.cc}/lib"
    "${lib.getLib stdenv.glibc}/lib"
  ];
in {

  emacsGccWrapped = super.symlinkJoin {
    name = "emacsGccWrapped";
    paths = [ sources.emacs-overlay.emacsGcc ];
    buildInputs = [ super.makeWrapper ];
    postBuild = ''
      wrapProgram $out/bin/emacs \
      --set LIBRARY_PATH ${libPath}
    '';
    meta.platforms = super.stdenv.lib.platforms.linux;
    passthru.nativeComp = true;
  };
} // sources.emacs-overlay
```