Add premise landing page membership support to custom post types

premise-cpt-support.php

<?php 
add_action('init', 'add_premise_member_support');
function add_premise_member_support() {
  $post_type=cpt; //replace this with the name of your custom post type
  add_post_type_support( $post_type, 'premise-member-access' );
}
?>

Not quite. The variable has to be part of the function unless you call a global. Also missing a ; after the variable.

add_action('init', 'add_premise_member_support');
function add_premise_member_support() {
$post_type=cpt; //replace this with the name of your custom post type
add_post_type_support( $post_type, 'premise-member-access' );
}