getPreferenceQualifier() method added
diff --git a/plugins/org.eclipse.dltk.ruby.core/src/org/eclipse/dltk/ruby/core/RubyLanguageToolkit.java b/plugins/org.eclipse.dltk.ruby.core/src/org/eclipse/dltk/ruby/core/RubyLanguageToolkit.java
index 67917fe..f7a4747 100644
--- a/plugins/org.eclipse.dltk.ruby.core/src/org/eclipse/dltk/ruby/core/RubyLanguageToolkit.java
+++ b/plugins/org.eclipse.dltk.ruby.core/src/org/eclipse/dltk/ruby/core/RubyLanguageToolkit.java
@@ -36,4 +36,8 @@
 	public String getLanguageContentType() {
 		return "org.eclipse.dltk.rubyContentType"; //$NON-NLS-1$
 	}
+	
+	public String getPreferenceQualifier() {
+		return RubyPlugin.PLUGIN_ID;
+	}
 }