xorg-libXau 1.0.9: fails to install during build with xcode 7 and 8 by Travis CI

[lhaeger (Lothar Haeger)]

Travis fails to build xca on xcode 7 and 8 (xcode 9 and 10 successed), see ​https://github.com/macports/macports-ports/pull/4878#issuecomment-514941344 for details. The log file (-> ​https://paste.macports.org/348c2fdd47ae) suggests that either a local copy of the port is missing or that name resolution is not set up properly:

----> Installing dependency (53 of 90) 'xorg-libXau' with variants '' (requesting '')
DEBUG: Copying /Users/travis/Library/Preferences/com.apple.dt.Xcode.plist to /opt/local/var/macports/home/Library/Preferences
DEBUG: Changing to port directory: /Users/travis/build/macports/macports-ports/x11/xorg-libXau
DEBUG: OS darwin/16.7.0 (Mac OS X 10.12) arch i386
DEBUG: adding the default universal variant
DEBUG: Reading variant descriptions from /Users/travis/build/macports/macports-ports/_resources/port1.0/variant_descriptions.conf
DEBUG: Running callback portconfigure::add_automatic_compiler_dependencies
DEBUG: Finished running callback portconfigure::add_automatic_compiler_dependencies
DEBUG: Running callback portbuild::add_automatic_buildsystem_dependencies
DEBUG: Finished running callback portbuild::add_automatic_buildsystem_dependencies
DEBUG: Running callback portstartupitem::add_notes
DEBUG: Finished running callback portstartupitem::add_notes
DEBUG: Attempting ln -sf /opt/local/var/macports/build/_Users_travis_build_macports_macports-ports_x11_xorg-libXau/xorg-libXau/work /Users/travis/build/macports/macports-ports/x11/xorg-libXau/work
DEBUG: dropping privileges: euid changed to 502, egid changed to 501.
DEBUG: Starting logging for xorg-libXau
DEBUG: macOS 10.12 (darwin/16.7.0) arch i386
DEBUG: MacPorts 2.5.4
DEBUG: Xcode 8.3.3
DEBUG: SDK 10.12
DEBUG: MACOSX_DEPLOYMENT_TARGET: 10.12
DEBUG: Executing org.macports.main (xorg-libXau)
DEBUG: dropping privileges: euid changed to 502, egid changed to 501.
DEBUG: archivefetch phase started at Thu Jul 25 07:51:09 GMT 2019
--->  Fetching archive for xorg-libXau
DEBUG: Executing org.macports.archivefetch (xorg-libXau)
DEBUG: euid/egid changed to: 0/0
DEBUG: chowned /opt/local/var/macports/incoming to macports
DEBUG: euid/egid changed to: 502/501
--->  xorg-libXau-1.0.9_0.darwin_16.x86_64.tbz2 doesn't seem to exist in /opt/local/var/macports/incoming/verified
--->  Attempting to fetch xorg-libXau-1.0.9_0.darwin_16.x86_64.tbz2 from https://packages-private.macports.org/xorg-libXau
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0DEBUG: Fetching archive failed: Could not resolve host: packages-private.macports.org
--->  Attempting to fetch xorg-libXau-1.0.9_0.darwin_16.x86_64.tbz2 from https://packages-private.macports.org/xorg-libXau
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0DEBUG: Fetching archive failed: Could not resolve host: packages-private.macports.org
--->  Attempting to fetch xorg-libXau-1.0.9_0.darwin_16.x86_64.tbz2 from https://packages.macports.org/xorg-libXau
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0DEBUG: Fetching archive failed: Could not resolve host: packages.macports.org

[l2dy (Zero King)]

That's a temporary network issue. I've restarted the build.

Installing dependency (75 of 91) 'qt5-qtbase' with variants '+openssl' (requesting '') ... [FAIL] (fetch)

Build failed on OS X 10.11 because qt5-qtbase requires macOS 10.12 or later.

[jmroot (Joshua Root)]

Travis network failure do happen sometimes, and there's nothing we can do about it unfortunately, except restart the build.