From e3527ea37f26cb357401b1d9c57cdc51a96972cd Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Mon, 6 Jun 2022 15:22:41 +0200
Subject: [PATCH] Detect broken symlinks when checking for a package's
 presence, fixes #6708

---
 src/Composer/Installer/LibraryInstaller.php | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/Composer/Installer/LibraryInstaller.php b/src/Composer/Installer/LibraryInstaller.php
index 71f45e8e4..d05b8e63f 100644
--- a/src/Composer/Installer/LibraryInstaller.php
+++ b/src/Composer/Installer/LibraryInstaller.php
@@ -90,7 +90,19 @@ class LibraryInstaller implements InstallerInterface, BinaryPresenceInterface
             return true;
         }
 
-        return (Platform::isWindows() && $this->filesystem->isJunction($installPath)) || is_link($installPath);
+        if (Platform::isWindows() && $this->filesystem->isJunction($installPath)) {
+            return true;
+        }
+
+        if (is_link($installPath)) {
+            if (realpath($installPath) === false) {
+                return false;
+            }
+
+            return true;
+        }
+
+        return false;
     }
 
     /**