MacportsでPython2.7.5をPython2.7.8に更新しようとして失敗

Macに入っているPython2.7を、2.7.5から2.7.8へと更新しようと以下のコマンド

$ sudo port upgrade python27

を打つと、以下のエラー

Warning: The Xcode Command Line Tools don't appear to be installed; most ports will likely fail to build.
Warning: Install them by running `xcode-select --install'.
--->  Computing dependencies for python27
--->  Configuring python27
Error: Failed to configure python27, consult /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python27/python27/work/Python-2.7.8/config.log
Error: org.macports.configure for port python27 returned: configure failure: command execution failed
Please see the log file for port python27 for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_python27/python27/main.log
Error: Unable to upgrade port: 1
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets

が出て更新できませんでした。

エラーメッセージにある通り、以下のコマンドを実行してみました。

$ xcode-select --install

もう一度以下のコマンドを実行すると、

$ sudo port upgrade python27

今度は以下のエラーが出てまた失敗しました。

--->  Cleaning python27
--->  Updating database of binaries
--->  Scanning binaries for linking errors               
--->  Found 10 broken file(s), matching files to ports   
--->  Found 5 broken port(s), determining rebuild order
--->  Rebuilding in order
     avahi @0.6.31 +gtk+python27+x11
     ImageMagick @6.8.5-5 +x11
     gconf @2.28.1 
     libproxy @0.4.11 +python27
     VLC @2.0.7 +mod+mpc+osd+qtkit+quartz
--->  Computing dependencies for dbus
--->  Building dbus
Error: org.macports.build for port dbus returned: command execution failed
Please see the log file for port dbus for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_dbus/dbus/main.log
Error: Unable to upgrade port: 1

このエラーはまだ解決できていません。