PhpMyAdmin Fatal error: call undefined __ () function

The server works with RHEL 7 and PHP 5.4.16. When I try to open / phpMyAdmin in my browser, I am presented with an error:

Fatal error: Call to undefined function __() in /usr/share/phpMyAdmin/libraries/core.lib.php on line 242

Call Stack
#   Time    Memory  Function    Location
1   0.0008  348000  {main}( )   ../index.php:0
2   0.0018  503144  require_once( '/usr/share/phpMyAdmin/libraries/common.inc.php' )    ../index.php:12
3   0.0252  4224464 PMA_Config->__construct( )  ../common.inc.php:304
4   0.0252  4224712 PMA_Config->load( ) ../Config.class.php:100
5   0.0265  4309888 PMA_Config->checkConfigSource( )    ../Config.class.php:849
6   0.0265  4311088 PMA_fatalError( )   ../Config.class.php:1169

      

        
        
        
      

    

I believe that I have installed all the required libraries and that apache has the appropriate permissions for the session.save_path directory, which were problems the previous times this question was asked. See: Calling undefined __ () function - phpMyAdmin

Can anyone give me a hint based on this call stack? Here are the functions from the lines referenced by the stack trace, with the corresponding line written in the left margin:

core.lib.php

on line 242:

   /**
   * displays the given error message on phpMyAdmin error page in foreign language,
   * ends script execution and closes session
   *
   * loads language file if not loaded already
   *
   * @param string       $error_message  the error message or named error message
   * @param string|array $message_args   arguments applied to $error_message
   * @param boolean      $delete_session whether to delete session cookie
   *
   * @return void
   */
   function PMA_fatalError(
       $error_message, $message_args = null, $delete_session = true
   ) {
   /* Use format string if applicable */
   if (is_string($message_args)) {
       $error_message = sprintf($error_message, $message_args);
   } elseif (is_array($message_args)) {
       $error_message = vsprintf($error_message, $message_args);
   }

   if ($GLOBALS['is_ajax_request']) {
       $response = PMA_Response::getInstance();
       $response->isSuccess(false);
       $response->addJSON('message', PMA_Message::error($error_message));
   } else {
       $error_message = strtr($error_message, array('<br />' => '[br]'));

       /* Load gettext for fatal errors */
       if (!function_exists('__')) {
           // It is possible that PMA_fatalError() is called before including
           // vendor_config.php which defines GETTEXT_INC. See bug #4557
           if (defined(GETTEXT_INC)) {
               include_once GETTEXT_INC;
           } else {
               include_once './libraries/php-gettext/gettext.inc';
           }
       }

       // these variables are used in the included file libraries/error.inc.php
242    $error_header = __('Error');
       $lang = $GLOBALS['available_languages'][$GLOBALS['lang']][1];
       $dir = $GLOBALS['text_dir'];

       // on fatal errors it cannot hurt to always delete the current session
       if ($delete_session
           && isset($GLOBALS['session_name'])
           && isset($_COOKIE[$GLOBALS['session_name']])
       ) {
           $GLOBALS['PMA_Config']->removeCookie($GLOBALS['session_name']);
       }

       // Displays the error message
       include './libraries/error.inc.php';
    }
    if (! defined('TESTSUITE')) {
       exit;
   }
   }

      

        
        
        
      

    

common.inc.php

on line 304:

304  $GLOBALS['PMA_Config'] = new PMA_Config(CONFIG_FILE);
     if (!defined('PMA_MINIMUM_COMMON')) {
         $GLOBALS['PMA_Config']->checkPmaAbsoluteUri();
     }

      

        
        
        
      

    

Config.class.php

on line 100:

    /**
    * constructor
    *
    * @param string $source source to read config from
    */
   function __construct($source = null)
   {
       $this->settings = array();

       // functions need to refresh in case of config file changed goes in
       // PMA_Config::load()
100    $this->load($source);

       // other settings, independent from config file, comes in
       $this->checkSystem();

       $this->isHttps();

       $this->base_settings = $this->settings;
   }

      

        
        
        
      

    

Config.class.php

on line 849:

    /**
    * loads configuration from $source, usually the config file
    * should be called on object creation
    *
    * @param string $source config file
    *
    * @return bool
    */
   function load($source = null)
   {
       $this->loadDefaults();

       if (null !== $source) {
           $this->setSource($source);
       }

       /**
        * We check and set the font size at this point, to make the font size
        * selector work also for users without a config.inc.php
        */
       $this->checkFontsize();

       if (! $this->checkConfigSource()) {
849       return false;
       }

      

        
        
        
      

    

Config.class.php

on line 1169:

     /**
     * check config source
     *
     * @return boolean whether source is valid or not
     */
    function checkConfigSource()
    {
        if (! $this->getSource()) {
            // no configuration file set at all
            return false;
        }

        if (! file_exists($this->getSource())) {
            $this->source_mtime = 0;
            return false;
        }

        if (! is_readable($this->getSource())) {
            // manually check if file is readable
            // might be bug #3059806 Supporting running from CIFS/Samba shares

            $contents = false;
            $handle = @fopen($this->getSource(), 'r');
            if ($handle !== false) {
                $contents = @fread($handle, 1); // reading 1 byte is enough to test
                @fclose($handle);
            }
            if ($contents === false) {
                $this->source_mtime = 0;
                PMA_fatalError(
                    sprintf(
                        function_exists('__')
                        ? __('Existing configuration file (%s) is not readable.')
                        : 'Existing configuration file (%s) is not readable.',
                        $this->getSource()
                    )
1169            );
                return false;
            }
        }

        return true;
    }