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.
php -i works.