port proctools returned: command execution failed

[nunoslvdr@…]

$ sudo port install clang-3.2 clang_select proctools
---> Computing dependencies for clang-3.2
---> Cleaning clang-3.2
---> Cleaning clang_select
---> Computing dependencies for proctools
---> Building proctools
Error: org.macports.build for port proctools returned: command execution failed
Please see the log file for port proctools for details:

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_sysutils_proctools/proctools/main.log

To report a bug, follow the instructions in the guide:

​http://guide.macports.org/#project.tickets

Error: Processing of port proctools failed

$ xcodebuild -version
Xcode 4.4.1
Build version 4F1003

$ /usr/bin/clang -v
Apple clang version 3.1 (tags/Apple/clang-318.0.61) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin11.4.0