diff --git a/core/includes/module.inc b/core/includes/module.inc
index ab45576..a2470b9 100644
--- a/core/includes/module.inc
+++ b/core/includes/module.inc
@@ -253,6 +253,7 @@ function _module_build_dependencies($files) {
     $files[$module]->requires = isset($data['paths']) ? $data['paths'] : array();
     $files[$module]->sort = $data['weight'];
   }
+  dsm($files);
   return $files;
 }
 
diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 504030e..eab5ba6 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -10,6 +10,15 @@
 
 use Drupal\Core\Utility\ThemeRegistry;
 
+
+/**
+ * @file
+ * API for loading and interacting with Drupal modules.
+ */
+
+use Drupal\Component\Graph\Graph;
+use Drupal\Core\Config\DatabaseStorage;
+
 /**
  * @defgroup content_flags Content markers
  * @{
@@ -2819,3 +2828,65 @@ function template_preprocess_region(&$variables) {
   $variables['attributes']['class'][] = drupal_region_class($variables['region']);
   $variables['theme_hook_suggestions'][] = 'region__' . $variables['region'];
 }
+
+/**
+ * Find dependencies any level deep and fill in required by information too.
+ *
+ * @param $files
+ *   The array of filesystem objects used to rebuild the cache.
+ *
+ * @return
+ *   The same array with the new keys for each module:
+ *   - requires: An array with the keys being the modules that this module
+ *     requires.
+ *   - required_by: An array with the keys being the modules that will not work
+ *     without this module.
+ */
+function _theme_build_dependencies($files) {
+  $return = array();
+
+  foreach ($files as $file) {
+    $graph[$file->name]['edges'] = array();
+    if (isset($file->info['dependencies']) && is_array($file->info['dependencies'])) {
+      foreach ($file->info['dependencies'] as $dependency) {
+        $dependency_data = drupal_parse_dependency($dependency);
+        $graph[$file->name]['edges'][$dependency_data['name']] = $dependency_data;
+      }
+    }
+    if (isset($file->base_themes) && is_array($file->base_themes)) {
+      foreach ($file->base_themes as $base_key => $base_theme) {
+        $base_theme = drupal_parse_info_file(drupal_get_path('theme', $base_key) . '/' . $base_key . '.info');
+
+        if (count($base_theme) > 0) {
+          foreach ($base_theme['dependencies'] as $dependency) {
+            $dependency_data = drupal_parse_dependency($dependency);
+            $graph[$file->name]['edges'][$dependency_data['name']] = $dependency_data;
+          }
+        }
+      }
+    }
+  }
+  $graph_object = new Graph($graph);
+  $graph = $graph_object->searchAndSort();
+  foreach ($graph as $theme => $data) {
+    $files = array();
+    foreach ($data['paths'] as $module) {
+      $files[$module['name']] = new stdClass();
+      $files[$module['name']]->name = $module['name'];
+
+      $status = db_select('system', 's')
+                ->fields('s', array('status'))
+                ->condition('name', $module['name'], '=')
+                ->execute()
+                ->fetchAssoc();
+
+      $files[$module['name']]->status = isset($status) ? $status['status'] : false;
+    }
+
+    $return[$theme] = new stdClass();
+//    $return[$theme]->required_by = isset($data['reverse_paths']) ? $data['reverse_paths'] : array();
+    $return[$theme]->requires = isset($files) ? $files : array();
+    $return[$theme]->sort = $data['weight'];
+  }
+  return $return;
+}
diff --git a/core/modules/system/system.admin.css b/core/modules/system/system.admin.css
index 957d3e0..985f0fa 100644
--- a/core/modules/system/system.admin.css
+++ b/core/modules/system/system.admin.css
@@ -207,6 +207,9 @@ table.screenshot {
 .system-themes-list-disabled .theme-info {
   min-height: 170px;
 }
+.theme-selector .theme-requires {
+	margin-bottom: 10px;
+}
 .theme-selector .incompatible {
   margin-top: 10px;
   font-weight: bold;
diff --git a/core/modules/system/system.admin.inc b/core/modules/system/system.admin.inc
index 72c50d4..3cb54c1 100644
--- a/core/modules/system/system.admin.inc
+++ b/core/modules/system/system.admin.inc
@@ -282,16 +282,37 @@ function system_theme_enable() {
     $theme = $_REQUEST['theme'];
     // Get current list of themes.
     $themes = list_themes();
+    $theme_deps = _theme_build_dependencies($themes);
 
     // Check if the specified theme is one recognized by the system.
     if (!empty($themes[$theme])) {
-      theme_enable(array($theme));
-      drupal_set_message(t('The %theme theme has been enabled.', array('%theme' => $themes[$theme]->info['name'])));
+      if ($theme_deps[$theme]->requires) {
+
+        $modules = $theme_deps[$theme]->requires;
+        $required = '<ul>';
+        foreach ($modules as $module) {
+          if ($module->status != 1) {
+            $required .= '<li>' . check_plain($module->name) . '</li>';
+          }
+        }
+
+        $output = '<div class="required">You must enable the following modules in order to enable ' . check_plain($themes[$theme]->info['name']) . ':</div>' . $required;
+
+        $output .= l(t('Cancel'), 'admin/appearance');
+        $output .= l(t('Enable'), 'admin/appearance/enable');
+
+        return $output;
+      }
+      else {
+        theme_enable(array($theme));
+        drupal_set_message(t('The %theme theme has been enabled.', array('%theme' => $themes[$theme]->info['name'])));
+        drupal_goto('admin/appearance');
+      }
     }
     else {
       drupal_set_message(t('The %theme theme was not found.', array('%theme' => $theme)), 'error');
+      drupal_goto('admin/appearance');
     }
-    drupal_goto('admin/appearance');
   }
   throw new AccessDeniedHttpException();
 }
@@ -2714,6 +2735,7 @@ function theme_system_themes_page($variables) {
     // Start new theme group.
     $output .= '<div class="system-themes-list system-themes-list-'. $state .' clearfix"><h2>'. $title .'</h2>';
 
+    $theme_dependencies = _theme_build_dependencies($theme_groups[$state]);
     foreach ($theme_groups[$state] as $theme) {
 
       // Theme the screenshot.
@@ -2722,11 +2744,60 @@ function theme_system_themes_page($variables) {
       // Localize the theme description.
       $description = t($theme->info['description']);
 
+      // Required Modules
+      $requires = '';
+      $enabled_reqs = 0;
+      $disabled_reqs = 0;
+      $disabled_mods = '';
+      $missing_reqs = 0;
+      if (!empty($theme_dependencies[$theme->name]->requires)) {
+        $theme_reqs = $theme_dependencies[$theme->name]->requires;
+          $missing = array();
+          foreach ($theme_reqs as $dependency) {
+            $missing[$dependency->name] = new stdClass();
+            $missing[$dependency->name]->name = $dependency->name;
+            $missing[$dependency->name]->status =  $dependency->status;
+          }
+
+          $dep_string = array();
+          foreach ($missing as $dep) {
+            if (is_null($dep->status)) {
+              $dep_string[] = t('@module (<span class="admin-missing">missing</span>)', array('@module' => $dep->name));
+              $missing_reqs++;
+            }
+            elseif ($dep->status == 0) {
+              $dep_string[] = t('@module (<span class="admin-disabled">disabled</span>)', array('@module' => $dep->name));
+              $disabled_mods .= $dep->name . ', ';
+              $disabled_reqs++;
+            }
+            elseif ($dep->status == 1) {
+              $dep_string[] = t('@module (<span class="admin-enabled">enabled</span>)', array('@module' => $dep->name));
+              $enabled_reqs++;
+            }
+          }
+
+          $m_length = count($dep_string);
+          $dependencies = '';
+
+
+          for ($i = 0; $i < $m_length; $i++) {
+            if ($i == $m_length - 1) {
+              $dependencies .= $dep_string[$i];
+            }
+            else {
+              $dependencies .= $dep_string[$i] . ', ';
+            }
+          }
+          if ($m_length > 0) {
+            $requires .= '<div class="theme-requires">' . t('Required modules: !dependencies', array('!dependencies' => $dependencies)) . '</div>';
+          }
+      }
+
       // Style theme info
       $notes = count($theme->notes) ? ' (' . join(', ', $theme->notes) . ')' : '';
       $theme->classes[] = 'theme-selector';
       $theme->classes[] = 'clearfix';
-      $output .= '<div class="'. join(' ', $theme->classes) .'">' . $screenshot . '<div class="theme-info"><h3>' . $theme->info['name'] . ' ' . (isset($theme->info['version']) ? $theme->info['version'] : '') . $notes . '</h3><div class="theme-description">' . $description . '</div>';
+      $output .= '<div class="'. join(' ', $theme->classes) .'">' . $screenshot . '<div class="theme-info"><h3>' . $theme->info['name'] . ' ' . (isset($theme->info['version']) ? $theme->info['version'] : '') . $notes . '</h3>' . $requires . '<div class="theme-description">' . $description . '</div>';
 
       // Make sure to provide feedback on compatibility.
       if (!empty($theme->incompatible_core)) {
@@ -2739,11 +2810,19 @@ function theme_system_themes_page($variables) {
         $output .= '<div class="incompatible">' . t('This theme requires PHP version @php_required and is incompatible with PHP version !php_version.', array('@php_required' => $theme->info['php'], '!php_version' => phpversion())) . '</div>';
       }
       elseif (!empty($theme->incompatible_base)) {
-        $output .= '<div class="incompatible">' . t('This theme requires the base theme @base_theme to operate correctly.', array('@base_theme' => $theme->info['base theme'])) . '</div>';
+        if ($missing_reqs > 0) {
+          $output .= '<div class="incompatible">' . t('In order to enable this theme, you must install the missing modules and the base theme @base_theme.', array('@base_theme' => $theme->info['base theme'])) . '</div>';
+        }
+        else {
+          $output .= '<div class="incompatible">' . t('In order to enable this theme, you must install the base theme @base_theme.', array('@base_theme' => $theme->info['base theme'])) . '</div>';
+        }
       }
       elseif (!empty($theme->incompatible_engine)) {
         $output .= '<div class="incompatible">' . t('This theme requires the theme engine @theme_engine to operate correctly.', array('@theme_engine' => $theme->info['engine'])) . '</div>';
       }
+      elseif ($missing_reqs > 0) {
+        $output .= '<div class="incompatible">' . t('In order to enable this theme, you must install the missing modules') . '</div>';
+      }
       else {
         $output .= theme('links', array('links' => $theme->operations, 'attributes' => array('class' => array('operations', 'clearfix'))));
       }