Tails - "unrecognized option" error when building tails

I'm starting from a clean Ubuntu install, and using this webpage as a reference: http://tails.boum.org/contribute/build/

I made sure I had all the packages listed there installed. When I run "lb clean", I get these errors:

P: Considering defaults defined in /etc/live/build.conf
live-build: unrecognized option '--binary-indices'
live-build: unrecognized option '--package-lists:standard'
live-build: unrecognized option '--syslinux-menu'
live-build: unrecognized option '--syslinux-splash'
live-build: unrecognized option '--syslinux-timeout'

Any suggestions on how I can resolve that error?