on FTP errors in the transient 5xx range. Transient FTP errors are in the
  4xx range. The code itself only tried on 5xx errors that occured _at login_.
  Now the retry code retries on all FTP transfer failures that ended with a
  4xx response.

  (http://curl.haxx.se/bug/view.cgi?id=2911279)

  instead of being repeated several times. This also include Authenticate: and
  Proxy-Authenticate: headers and while this hardly every happens in real life
  it will confuse libcurl which does not properly support it for all headers -
  like those Authenticate headers.

have been fixed!

Added '--configure' option to curl-config to display original configure arguments when curl was built

curl.h, adjusting auto-makefiles include path, to enhance portability to
OS's without an orthogonal directory tree structure such as OS/400.

and another is sponsoring more

As it actually builds with gcrypt these days, but not the NSS functions.

done!

going on

  sends the 220 response or otherwise is dead slow, libcurl will not
  acknowledge the connection timeout during that phase but only the "real"
  timeout - which may surprise users as it is probably considered to be the
  connect phase to most people. Brought up (and is being misunderstood) in:
  http://curl.haxx.se/bug/view.cgi?id=2844077