openssh port fails to build on Snow Leopard

[conradwt (Conrad Taylor)]

The openssh port fails to build on Mac OS 10.6.2 and the transcript of the session appears below:

$ sudo port selfupdate
Password:
--->  Updating the ports tree
--->  Updating MacPorts base sources using rsync
MacPorts base version 1.8.1 installed,
MacPorts base version 1.8.1 downloaded.
--->  MacPorts base is already the latest version

The ports tree has been updated. To upgrade your installed ports, you should run
  port upgrade outdated
$ sudo port sync
Password:
$ sudo port upgrade openssh
Password:
--->  Computing dependencies for openssh
--->  Fetching openssh
--->  Attempting to fetch openssh-5.3p1-hpn13v6.diff.gz from http://distfiles.macports.org/openssh
--->  Attempting to fetch openssh-5.3p1-hpn13v6.diff.gz from http://www.psc.edu/networking/projects/hpn-ssh/
--->  Attempting to fetch openssh-5.3p1-hpn13v6.diff.gz from http://aarnet.au.distfiles.macports.org/pub/macports/mpdistfiles/openssh
--->  Attempting to fetch openssh-5.3p1-hpn13v6.diff.gz from http://arn.se.distfiles.macports.org/openssh
--->  Attempting to fetch openssh-5.3p1-hpn13v6.diff.gz from http://svn.macports.org/repository/macports/distfiles/openssh
--->  Attempting to fetch openssh-5.3p1-hpn13v6.diff.gz from http://svn.macports.org/repository/macports/distfiles/general/
Error: Target org.macports.fetch returned: fetch failed
Error: Unable to upgrade port: 1

[blb@…]

Dup of #21840.