Error: Current platform “darwin 21” does not match expected platform “darwin 19”

升级系统之后，提示：

[~]$ sudo port -v install e2fsprogs
Password:
Error: Current platform "darwin 21" does not match expected platform "darwin 19"
Error: If you upgraded your OS, please follow the migration instructions: https://trac.macports.org/wiki/Migration
OS platform mismatch
    while executing
"mportinit ui_options global_options global_variations"
Error: /opt/local/bin/port: Failed to initialize MacPorts, OS platform mismatch

按照要求，重新安装Macport即可。