I have no idea about your apache install and modules, google might help, I found this (although not very promising):
http://serverfault.com/questions/464319/enabling-mod-headers-on-apache2
In any case, .htaccess file is not a requirement, headers are there to prevent caching files, and that is important only when you upgrade FOP2 versions for now.. so you can get it working with no issues without that .htaccess file.
