gistfile1.pp

class role::myapp(
  $environment,
) {
  include profile::apache
  include profile::apache::status
  include ::apache::mod::php
  include ::apache::mod::deflate
  #include ::apache::mod::setenvif

  apache::vhost { 'myapp.mysite.com':
    vhost_name  => '*',
    port        => '80',
    docroot     => '/var/www/myapp',
    serveradmin => '[email protected]',
    #servername  => 'myapp.mysite.com',
    serveraliases => [
      'qa4.myapp.mysite.com',
    ],
    # THIS IS THE SPOT THAT'S NOT WORKING. I want to set our environment variable accordingly
    setenv => ["MDOT_ENV $environment"],
  }
}

gistfile2.pp

class role::myapp::dev{
  class{'::role::myapp':
    environment => 'dev',
  }
}

What's the syntax I should use for the 3rd line in the code below?

class role::myapp::dev inherits role::myapp {
$myapp_env_var = "dev"
environment => 'dev',
}