xclock: add version check

pkgs/by-name/xc/xclock/package.nix

@@ -5,6 +5,7 @@
   meson,
   ninja,
   pkg-config,
+  versionCheckHook,
   wrapWithXFileSearchPathHook,
   libx11,
   libxaw,
@@ -53,6 +54,10 @@ stdenv.mkDerivation (finalAttrs: {
     (lib.mesonOption "appdefaultdir" "${placeholder "out"}/share/X11/app-defaults")
   ];
 
+  nativeInstallCheckInputs = [ versionCheckHook ];
+  versionCheckProgramArg = "-version";
+  doInstallCheck = true;
+
   passthru.updateScript = nix-update-script { extraArgs = [ "--version-regex=xclock-(.*)" ]; };
 
   meta = {