Index: ironruby/Hosting/RubyEngineOptions.cs
===================================================================
--- ironruby/Hosting/RubyEngineOptions.cs	(revision 76)
+++ ironruby/Hosting/RubyEngineOptions.cs	(working copy)
@@ -30,7 +30,13 @@
 
         private string[] _arguments;
         private bool _showWarnings;
+        private List<string> _modules;
 
+        public List<string> RequiredModules {
+            get { return _modules; }
+            set { _modules = value; }
+        }
+
         public string[] Arguments {
             get { return _arguments; }
             set { _arguments = value; }
Index: ironruby/Hosting/RubyOptionsParser.cs
===================================================================
--- ironruby/Hosting/RubyOptionsParser.cs	(revision 76)
+++ ironruby/Hosting/RubyOptionsParser.cs	(working copy)
@@ -86,6 +86,18 @@
                     break;
 
                 default:
+                    if (arg.StartsWith("-r"))
+                    {
+                        if (_engineOptions.RequiredModules == null)
+                            _engineOptions.RequiredModules = new List<string>();
+
+                        string module = arg.Substring(2).Trim();
+                        
+                        if (!_engineOptions.RequiredModules.Contains(module))
+                            _engineOptions.RequiredModules.Add(module);
+                        break;
+                    }
+
                     base.ParseArgument(arg);
                     if (ConsoleOptions.FileName != null) {
                         PushArgBack();
@@ -101,6 +113,7 @@
 
             string [,] rubyOptions = new string[,] {
                 { "-opt", "dummy" }, 
+                { "-rmodule", "require module" }, 
             };
 
             // Append the Ruby-specific options and the standard options
Index: ironruby/Runtime/RubyContext.cs
===================================================================
--- ironruby/Runtime/RubyContext.cs	(revision 76)
+++ ironruby/Runtime/RubyContext.cs	(working copy)
@@ -90,6 +90,14 @@
         public override CodeBlock ParseSourceCode(CompilerContext/*!*/ context) {
             Contract.RequiresNotNull(context, "context");
 
+            if (EngineOptions.RequiredModules != null)
+            {
+                foreach (string module in EngineOptions.RequiredModules)
+                    // TODO: does self need to be passed to LoadModule?
+                    ExecutionContext.Loader.LoadModule(CodeContext, null , module, LoadFlags.LoadOnce);
+                EngineOptions.RequiredModules = null;
+            }
+
             SourceUnitTree ast = new Parser().Parse(context);
             return (ast != null) ? ast.Transform(new AstGenerator(context), context.SourceUnit.Kind) : null;
         }