diff --git a/src/Composer/Installer/LibraryInstaller.php b/src/Composer/Installer/LibraryInstaller.php
index 898c4a6b9..727e84c85 100644
--- a/src/Composer/Installer/LibraryInstaller.php
+++ b/src/Composer/Installer/LibraryInstaller.php
@@ -123,6 +123,11 @@ class LibraryInstaller implements InstallerInterface
      */
     public function getInstallPath(PackageInterface $package)
     {
+        $installDir = $package->getInstallDir();
+        if (isset($installDir))
+        {
+            return $installDir;
+        }
         $targetDir = $package->getTargetDir();
         return ($this->directory ? $this->directory.'/' : '') . $package->getName() . ($targetDir ? '/'.$targetDir : '');
     }
diff --git a/src/Composer/Package/BasePackage.php b/src/Composer/Package/BasePackage.php
index 786c58ae5..c22b3fdab 100644
--- a/src/Composer/Package/BasePackage.php
+++ b/src/Composer/Package/BasePackage.php
@@ -27,6 +27,7 @@ abstract class BasePackage implements PackageInterface
     protected $prettyName;
     protected $repository;
     protected $id;
+    protected $installDir;
 
     /**
      * All descendants' constructors should call this parent constructor
@@ -92,6 +93,16 @@ abstract class BasePackage implements PackageInterface
         return $this->id;
     }
 
+    public function setInstallDir($dir)
+    {
+        $this->installDir = $dir;
+    }
+
+    public function getInstallDir()
+    {
+        return $this->installDir;
+    }
+
     /**
      * Checks if the package matches the given constraint directly or through
      * provided or replaced packages
diff --git a/src/Composer/Package/Loader/ArrayLoader.php b/src/Composer/Package/Loader/ArrayLoader.php
index 4977763b8..51e0729e3 100644
--- a/src/Composer/Package/Loader/ArrayLoader.php
+++ b/src/Composer/Package/Loader/ArrayLoader.php
@@ -53,6 +53,10 @@ class ArrayLoader
             $package->setTargetDir($config['target-dir']);
         }
 
+        if (isset($config['install-dir'])) {
+            $package->setInstallDir($config['install-dir']);
+        }
+
         if (isset($config['repositories'])) {
             $repositories = array();
             foreach ($config['repositories'] as $repoName => $repo) {