saksham's haskell packages override

        haskellPackages = super.haskellPackages.override {
            overrides = self: super: {
                local-gtk-traymanager =
                    self.callPackage /home/saksham/code/gtk-traymanager {
                        gtk3 = super.gtk3.override { inherit (pkgs) gtk3; };
                    };
            };
        };