clang 3.4 can't be configured (part of a selfupdate)

[ftp83plus]

Hello there, 

I am currently attempting a "port selfupdate" operation before installing two ports I'd like to test.

However, it fails for a reason I don't understand:
Terminal shows:
--->  Verifying checksums for clang-3.4
--->  Extracting clang-3.4
--->  Applying patches to clang-3.4
--->  Configuring clang-3.4
Error: Failed to configure clang-3.4, consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-3.4/clang-3.4/work/build/config.log
Error: org.macports.configure for port clang-3.4 returned: configure failure: command execution failed
Please see the log file for port clang-3.4 for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_llvm-3.4/clang-3.4/main.log
Error: Problem while installing clang-3.4
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets

Pastebin of the main.log
http://pastebin.com/VrEfMHzA

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