thanks Clemens
following your instructions it worked!

2014-03-20 20:21 GMT+01:00 Clemens Lang <[email protected]>:

> Hi,
>
> > Dear users,
> > I am trying to install the port
> > gnuplot on my macbook air with OS X 10.9.2
> > with the command
> > sudo port install gnuplot I obtain the following error message:
> >
> > ---> Computing dependencies for libpng
> > ---> Extracting libpng
> > Error: org.macports.extract for port libpng returned: command execution
> > failed
> > Please see the log file for port libpng for details:
> >
> /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_graphics_libpng/libpng/main.log
> > Error: Unable to upgrade port: 1
> > Error: Unable to execute port: upgrade fontconfig failed
>
> Did you recently upgrade to Mavericks? If so, read
>  https://trac.macports.org/wiki/MavericksProblems and
>  https://trac.macports.org/wiki/Migration.
>
> --
> Clemens Lang
>
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