A SpamAssassin question

Following the SpamAssassin install tutorial, I have a question. The tutorial says to type "sudo spamd -F0 -d -x" to start up the SpamAssassin process. I found that I have to go to /usr/local/bin, and from there type sudo ./spamd -F0 -x to get it to run. Also, once I enter this, I get a message the -F option has been removed. Does this mean I've missed something vital? Thanks, Hugo Heriz-Smith