diff --color -ru composer-2.7.4.orig/src/Composer/Command/DiagnoseCommand.php composer-2.7.4/src/Composer/Command/DiagnoseCommand.php
--- composer-2.7.4.orig/src/Composer/Command/DiagnoseCommand.php	2024-04-22 21:17:03.000000000 +0200
+++ composer-2.7.4/src/Composer/Command/DiagnoseCommand.php	2024-04-25 09:31:04.167503572 +0200
@@ -490,7 +490,7 @@
         $repoSet = new RepositorySet();
         $installedJson = new JsonFile(__DIR__ . '/../../../vendor/composer/installed.json');
         if (!$installedJson->exists()) {
-            return '<warning>Could not find Composer\'s installed.json, this must be a non-standard Composer installation.</>';
+            return '<warning></><comment>Composer and dependencies are managed with Portage. Checking Composer\'s vulnerabilities from composer is not supported. Please make sure to install the latest version or report missing updates to https://github.com/gentoo-php-overlay/php-overlay</>';
         }
 
         $localRepo = new FilesystemRepository($installedJson);