let
  unstable = nixpkgs-unstable.legacyPackages.<ARCH>;
  buildGo124Module = unstable.buildGoModule.override { go = unstable.go_1_24; };
in
...

is there a way to make a non-fixed-output derivation with buildGoModule?
I have a package with dependencies that need to be patched to point to nix store
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packages = rec {
env86 = pkgs.buildGoModule {
name = "env86";
# TODO: Real version
version = "1";
src = ./.;
buildInputs = with pkgs; [
gtk3
];

  # HACK: this package uses purego to link libraries at runtime,
  # which will fail since we have no global libs, patch the library
  # paths to point to nix store
  modPostBuild = ''
    sed -i 's|"libgtk-3.so"|"${pkgs.gtk3}/lib/libgtk-3.so"|' vendor/tractor.dev/toolkit-go/desktop/linux/linux.go
  '';
  vendorHash = pkgs.lib.fakeHash;
  outputHashMode = null;
  outputHashAlgo = null;
  outputHash = null;

  # HACK: guest86 needs to be built externally
  preBuild = ''
    rm -r cmd/guest86
  '';
};
default = env86;

};
but this still results in illegal path references in fixed-output derivation