mate-power-manager: Fix backlight-helper polkit popup (#540734)

nixos/modules/services/x11/desktop-managers/mate.nix

@@ -141,6 +141,10 @@ in
       services.libinput.enable = mkDefault true;
 
       security.pam.services.mate-screensaver.unixAuth = true;
+      security.polkit = {
+        enable = true;
+        enablePkexecWrapper = mkDefault true;
+      };
 
       xdg.portal.configPackages = mkDefault [ pkgs.mate-desktop ];
 

pkgs/by-name/ma/mate-power-manager/package.nix

@@ -56,7 +56,16 @@ stdenv.mkDerivation (finalAttrs: {
     mate-panel
   ];
 
-  configureFlags = [ "--enable-applets" ];
+  configureFlags = [
+    "--enable-applets"
+    "--sbindir=$(out)/bin"
+  ];
+
+  postPatch = ''
+    # Fixes polkit popup after `nixos-rebuild switch`.
+    substituteInPlace src/gpm-brightness.c \
+      --replace-fail 'SBINDIR "/mate-power-backlight-helper' '"/run/current-system/sw/bin/mate-power-backlight-helper'
+  '';
 
   enableParallelBuilding = true;