llvm-3.5 +assertions Configure error- unsupported configuration

[betogil@…]

--->  Cleaning clang-3.3
--->  Removing work directory for clang-3.3
--->  Computing dependencies for llvm-3.5.
--->  Fetching archive for llvm-3.5
--->  llvm-3.5-3.5-r206638_0+assertions.darwin_12.x86_64.tbz2 doesn't seem to exist in /opt/local/var/macports/incoming/verified
--->  Attempting to fetch llvm-3.5-3.5-r206638_0+assertions.darwin_12.x86_64.tbz2 from http://mse.uk.packages.macports.org/sites/packages.macports.org/llvm-3.5
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Attempting to fetch llvm-3.5-3.5-r206638_0+assertions.darwin_12.x86_64.tbz2 from http://packages.macports.org/llvm-3.5
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
--->  Attempting to fetch llvm-3.5-3.5-r206638_0+assertions.darwin_12.x86_64.tbz2 from http://nue.de.packages.macports.org/macports/packages/llvm-3.5
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
--->  Fetching distfiles for llvm-3.5
Error: llvm-3.5 requires a C++11 runtime, which your configuration does not allow
Error: org.macports.fetch for port llvm-3.5 returned: unsupported configuration
Warning: targets not executed for llvm-3.5: org.macports.install org.macports.fetch org.macports.checksum org.macports.extract org.macports.patch org.macports.configure org.macports.build org.macports.destroot
Please see the log file for port llvm-3.5 for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-3.5/llvm-3.5/main.log
Error: Unable to upgrade port: 1
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets

[mf2k (Frank Schima)]

The Milestone field is for use by Macports team members only, please do not set it.

In the future use WikiFormatting, fill in the Port field and Cc the port maintainers (port info --maintainers llvm-3.5).