- Ingmar Runge enhanced libcurl's FTP engine to support the PRET command. This

command is a special "hack" used by the drftpd server, but even though it is
  a custom extension I've deemed it fine to add to libcurl since this server
  seems to survive and people keep using it and want libcurl to support
  it. The new libcurl option is named CURLOPT_FTP_USE_PRET, and it is also
  usable from the curl tool with --ftp-pret. Using this option on a server
  that doesn't support this command will make libcurl fail.

lib/strerror.c

@@ -81,6 +81,9 @@ curl_easy_strerror(CURLcode error)
   case CURLE_REMOTE_ACCESS_DENIED:
     return "Access denied to remote resource";
 
+  case CURLE_FTP_PRET_FAILED:
+    return "FTP: The server did not accept the PRET command.";
+
   case CURLE_FTP_WEIRD_PASS_REPLY:
     return "FTP: unknown PASS reply";