How to downgrade FreeBSD's Ports
su as root cd /usr/ports/ports-mgmt/portdowngrade; make install clean; rehash setenv CVSROOT :pserver:anoncvs@anoncvs.tw.FreeBSD.org:/home/ncvs cvs login portdowngrade www/p5-FastCGI portsdb -Uu portupgrade -f p5-FastCGI