We can easily auto-load libraries in Laravel 4.x by using namespaces in our application. Then put all libraries you code under that namespace.

Suppose our directory structure would then be:

libraries
    Myapp
        Search (note directory is capitalized)
            Search.php
            SearchFacade.php
            SearchServiceProvider.php
        AnotherLib

Then your classes will follow that namespace:

File: Myapp/Search/Search.php

<?php namespace Myapp\Search;

class Search { ... }

And finally, your autoloading setup:

"autoload": {
    "classmap": [
        "app/commands",
        "app/controllers",
        "app/models",
        "app/libraries",
        "app/database/migrations",
        "app/database/seeds",
        "app/tests/TestCase.php"
    ]
    ,
    "psr-0": {
         "Myapp": "app/libraries"
    }
},

By this way we can autoload 'libraries' in Laravel 4.x.