rebuild kernel module on update

gistfile1.pp

class kernel(version='latest') {                                                                                                                                          
  package { 'rhel-kernel':                                                                                                                                                
    ensure => $version,                                                                                                                                                   
    alias  => kernel,                                                                                                                                                     
    notify => Exec['rebuild gahrbaj'],                                                                                                                                    
  }                                                                                                                                                                       
                                                                                                                                                                          
  exec { 'rebuild gahrbaj':                                                                                                                                               
    cwd         => '/foo/bar/gahrbaj',                                                                                                                                    
    command     => '/usr/bin/make; /usr/bin/make install', # commands to bulid and install module                                                                                                                 
    require     => Package['rhel-kernel'],                                                                                                                                
    refreshonly => true, # only attempt if rhel-kernel has been updated                                                                                                   
  }                                                                                                                                                                       
}

node example.com {
  class { 'kernel':
    version => '3.2.7'
  }
}