===>  Installing for apache-2.0.63
===>   apache-2.0.63 depends on file: /usr/local/bin/perl5.8.8 - found
===>   Generating temporary packing list
===>  Checking if www/apache20 already installed
===>   apache-2.0.63 is already installed
      You may wish to ``make deinstall'' and install this port again
      by ``make reinstall'' to upgrade it properly.
      If you really wish to overwrite the old port of www/apache20
      without deleting it first, set the variable "FORCE_PKG_REGISTER"
      in your environment or the "make install" command line.
*** Error code 1

Stop in /usr/ports/www/apache20.