Upgrading port fails—Error rebuilding qt4-mac

[Eneko Gotzon Ares]

Hello all.

Trying to upgrade ports an error happens:
·Unable to upgrade port: 1
·Error rebuilding qt4-mac
·Three unsuccessful attempts.
·Ports clean done.
I upgrade the ports one by one to know what they are and what they do.
I also run the -u code to uninstall the old versions of the ports.

Machine:
·2.1 GHz PowerPC G5
·Mac OS X.5.8 (Leopard)
·MacPorts Base v2.1.3

TERMINAL COMPLETE MESSAGE
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TERMINAL MESSAGE SUMMARY
{{{
$ sudo port -u upgrade gdk-pixbuf2
<?>
--->  Configuring qt4-mac
Error: org.macports.configure for port qt4-mac returned: configure  
failure: command execution failed
<?>
Error: Unable to upgrade port: 1
Error rebuilding qt4-mac
     while executing
"error "Error rebuilding $portname""
     (procedure "revupgrade_scanandrebuild" line 382)
     invoked from within
"revupgrade_scanandrebuild broken_port_counts $opts"
     (procedure "macports::revupgrade" line 5)
     invoked from within
"macports::revupgrade $opts"
     (procedure "action_revupgrade" line 2)
     invoked from within
"action_revupgrade $action $portlist $opts"
     (procedure "action_upgrade" line 25)
     invoked from within
"$action_proc $action $portlist [array get global_options]"
     (procedure "process_cmd" line 95)
     invoked from within
"process_cmd $remaining_args"
     invoked from within
"if { [llength $remaining_args] > 0 } {

     # If there are remaining arguments, process those as a command
     set exit_status [process_cmd $remaining..."
     (file "/opt/local/bin/port" line 4785)
}}}

This "/opt/local/bin/port" file is an UNIX Executable File.
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I find no mention of CONSOLE MESSAGES.

Please, what should I do?

Thanks a lot :)
--
Eneko Gotzon Ares