Installing ghostscript using MacPorts fails
The problem is that macports is trying to use /usr/bin/gnutar, but can't find it. I think this happens because your version of macports was not built for mavericks, and therefore doesn't know where the tools (such as gnutar) actually are. There are different versions of macports 2.2.1, depending on your version of OS X.

You should reinstall macports (for mavericks) from the binary here: https://distfiles.macports.org/MacPorts/MacPorts-2.2.1-10.9-Mavericks.pkg

you should probably also run xcode-select --install