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$ sudo port selfupdate
Password:
--->  Updating the ports tree
--->  Updating MacPorts base sources using rsync
MacPorts base version 1.9.2 installed,
MacPorts base version 1.9.2 downloaded.
--->  MacPorts base is already the latest version

The ports tree has been updated. To upgrade your installed ports, you should run
  port upgrade outdated


$ port outdated
The following installed ports are outdated:
gmp                            5.0.1_1 < 5.0.2_0         


$ sudo port upgrade outdated
--->  Configuring gmp
Error: Target org.macports.configure returned: configure failure: shell command failed (see log for details)
Log for gmp is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_gmp/main.log
Error: Unable to upgrade port: 1
To report a bug, see <http://guide.macports.org/#project.tickets>