Since freebsd 4.11 is EOL there is some special way to update it.
modify following file.
*default release=cvs tag=RELEASE_4_EOL
NOTE : in above line - you are replacing “.” with “RELEASE_4_EOL”
Now in order to update file use cvsup command.
cvsup -g -L 2 -h cvsup3.us.freebsd.org /usr/share/examples/cvsup/ports-supfile