# Pastebin pv7p2TTg
    # Patch in explicit-sync.
    nixpkgs.overlays = [ 
      (lib.mkBefore (final: prev: {
        # https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/90              
        wayland-protocols = prev.wayland-protocols.overrideAttrs (oldAttrs: {                       
          src = builtins.fetchGit {                                                                 
            url = "https://gitlab.freedesktop.org/emersion/wayland-protocols.git";                  
            ref = "linux-explicit-sync-v2";                                                         
            rev = "8ead72b7559cf2dc6f24943eb6f48f2d93cb8a78";                                       
          };                                                                                        
        });                                                                                         
        # https://gitlab.freedesktop.org/xorg/proto/xorgproto/-/merge_requests/59                   
        xorgproto = prev.xorgproto.overrideAttrs (oldAttrs: {                                       
          src = builtins.fetchGit {                                                                 
            url = "https://gitlab.freedesktop.org/ekurzinger/xorgproto.git";                        
            ref = "explicit-sync";                                                                  
            rev = "08c729e70b565508f36ad0df086b13b8bb6b0813";                                       
          };                                                                                        
        });                                                                                         
      }))                                                                                           
      (lib.mkAfter (final: prev: {  
        # https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/967
        xwayland = prev.xwayland.overrideAttrs (oldAttrs: {     
          src = builtins.fetchGit {                             
            url = "https://gitlab.freedesktop.org/ekurzinger/xserver.git";
            ref = "explicit-sync";                              
            rev = "feed851d6947423a8a4af21ee3cc63d3ff41891f";   
          };                                                    
          buildInputs = oldAttrs.buildInputs ++ (with final; [ udev xorg.libpciaccess ]);
        });                                                     
      }))                                                       
    ];