diff --git a/core/Requirements.php b/core/Requirements.php
index 2cc9ef7a7..41fbbe67b 100644
--- a/core/Requirements.php
+++ b/core/Requirements.php
@@ -526,6 +526,7 @@ class Requirements {
 				$fileContent = file_get_contents($base . $file);
 				// if we have a javascript file and jsmin is enabled, minify the content
 				if(stripos($file, '.js') && self::$combine_js_with_jsmin) {
+					require_once('thirdparty/jsmin/JSMin.php');
 					$fileContent = JSMin::minify($fileContent);
 				}
 				// write a header comment for each file for easier identification and debugging
diff --git a/core/model/YamlFixture.php b/core/model/YamlFixture.php
index fee96d583..c02826644 100644
--- a/core/model/YamlFixture.php
+++ b/core/model/YamlFixture.php
@@ -1,4 +1,7 @@
 <?php
+
+require_once 'thirdparty/spyc/Spyc.php';
+
 /**
  * Uses the Spyc library to parse a YAML document (see http://yaml.org).
  * YAML is a simple markup languages that uses tabs and colons instead of the more verbose XML tags, 
diff --git a/thirdparty/_manifest_exclude b/thirdparty/_manifest_exclude
new file mode 100644
index 000000000..e69de29bb