I can not install anything with macport

[iodice.sara@…]

I have a mac book pro with mac OS X 10.6.7. I can not install anything with macport.

For example, if I try to execute "sudo port install opencv", I have this error:

---> Installing bzip2 @1.0.6_0 Error: Target org.macports.install returned: /usr/bin/tar: invalid option -- q Try `/usr/bin/tar --help' for more information. Error: Failed to install bzip2

This is the log file:

version:1 :debug:main changing euid/egid - current euid: 0 - current egid: 0 :debug:main egid changed to: 501 :debug:main euid changed to: 502 :debug:main Executing org.macports.main (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.archivefetch (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.fetch (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.checksum (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.extract (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.patch (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.configure (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.build (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:main Skipping completed org.macports.destroot (bzip2) :debug:main Privilege de-escalation not attempted as not running as root. :debug:install install phase started at Thu Aug 25 15:08:06 CEST 2011 :notice:install ---> Installing bzip2 @1.0.6_0 :debug:install Can't run install on this port without elevated privileges. Escalating privileges back to root. :debug:install euid changed to: 0. egid changed to: 0. :debug:install Executing org.macports.install (bzip2) :error:install Target org.macports.install returned: /usr/bin/tar: invalid option -- q Try `/usr/bin/tar --help' for more information. :debug:install Backtrace: /usr/bin/tar: invalid option -- q Try `/usr/bin/tar --help' for more information.

while executing

"exec [findBinary tar ${portutil::autoconf::tar_path}] -xOj${qflag}f $location +CONTENTS"

(procedure "extract_contents" line 6) invoked from within

"extract_contents $location $portarchivetype"

(procedure "portinstall::install_main" line 19) invoked from within

"$procedure $targetname" :info:install Warning: the following items did not execute (for bzip2): org.macports.activate org.macports.install :error:install Failed to install bzip2 :notice:install Log for bzip2 is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_archivers_bzip2/bzip2/main.log

Please, help me …

Thanks