# Pastebin jG3En2VF
$ port contents p5.26-tk | grep Tk.bundle
  /opt/local/lib/perl5/vendor_perl/5.26/darwin-thread-multi-2level/auto/Tk/Tk.bundle

$ otool -L /opt/local/lib/perl5/vendor_perl/5.26/darwin-thread-multi-2level/auto/Tk/Tk.bundle
/opt/local/lib/perl5/vendor_perl/5.26/darwin-thread-multi-2level/auto/Tk/Tk.bundle:
        /opt/local/lib/libX11.6.dylib (compatibility version 10.0.0, current version 10.0.0)
        /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.0.0)