portsのアップデートにしっぱいした
# port selfupdate
MacPorts base version 2.1.3 installed,
MacPorts base version 2.2.1 downloaded.
Installing new MacPorts release in /opt/local as root:admin; permissions 0755; Tcl-Package in /Library/Tcl
Error: /opt/local/bin/port: port selfupdate failed: Error installing new MacPorts base: command execution failed
# xcode-select --installthen
# port selfupdate