Can't install Drush on FreeBSD I'm running FreeBSD 10 with PHP5.3.28

I can't use the port or package to install Drush because it will install the default PHP (5.4) as a dependency.  So I installed Drush manually.
Then when I invoked Drush it said:


  Can't find PHP


So I added this to csh.cshrc: setenv DRUSH_PHP /usr/local/bin/php

After reboot I now get this:


  Could not open input file: @pear_directory@/drush/drush.php


I don't have PEAR on my system and trying to install it also means it will install PHP5.4.  I was able to install Composer manually but I'm afraid it too will install PHP5.4 as a dependency for Drush.

Any ideas?

Note: php -i works.
composer install will not install php; go ahead and follow the instructions in the Drush README for the composer install, and you should be fine.

Note also that Drush master (Drush 7) will soon require php 5.4, so you should use Drush 6 if you'd like to stick with php 5.3.

I don't have a FreeBSD system to try this on, but composer global require drush/drush:6.* works fine on my Linux box.  If you have problems with the composer install, you might want to try composer self-update, to insure that you have a recent version; I can't imagine why FreeBSD should be different than Linux when finding and installing Drush.