코드내에서 환경설정이 가능하더라...

// Works in all PHP versions
ini_set('include_path', '/inc');
// Works in all PHP versions
echo ini_get('include_path');

// Works as of PHP 4.3.0
set_include_path('지정할경로');
// Works as of PHP 4.3.0
echo get_include_path();