Here are the commands I had to run to get things working on my FreeBSD 9.0 box that was still using old pkg_ tools.
# portsclean -C
Unknown modifier 't'
Unknown modifier 't'
Unknown modifier 't'
Unknown modifier 't'
Unknown modifier 't'
"/usr/ports/Mk/bsd.sites.mk", line 958: Malformed conditional (!empty(_PERL_CPAN_ID) && ${_PERL_CPAN_FLAG:tl} == "cpan")
Unknown modifier 't'
"Mk/bsd.port.mk", line 2929: Unclosed conditional/for loop
"Mk/bsd.port.mk", line 2929: Unexpected end of file in for loop.
"Mk/bsd.port.mk", line 6711: Unclosed conditional/for loop
"Mk/bsd.port.mk", line 6711: Unexpected end of file in for loop.
1 open conditional:
at line 1179 (evaluated to true)
make: fatal errors encountered -- cannot continue
/usr/local/lib/ruby/site_ruby/1.9/pkgtools/portsdb.rb:237:in `join': can't convert nil into String (TypeError)
from /usr/local/lib/ruby/site_ruby/1.9/pkgtools/portsdb.rb:237:in `index_file'
from /usr/local/lib/ruby/site_ruby/1.9/pkgtools/portsdb.rb:247:in `db_dir='
from /usr/local/lib/ruby/site_ruby/1.9/pkgtools/portsdb.rb:167:in `setup'
from /usr/local/lib/ruby/site_ruby/1.9/pkgtools/pkgtools.rb:242:in `init_pkgtools_global'
from /usr/local/sbin/portsclean:134:in `block in main'
from /usr/local/lib/ruby/1.9/optparse.rb:882:in `initialize'
from /usr/local/sbin/portsclean:70:in `new'
from /usr/local/sbin/portsclean:70:in `main'
from /usr/local/sbin/portsclean:727:in `<main>'
Solution Code:
pkg_add -r http://ftp-archive.freebsd.org/pub/FreeBSD-Archive/ports/i386/packages-9.0-release/devel/bmake-20111111.tbz cp /usr/bin/make /usr/bin/make.old rm /usr/bin/make ln -sv /usr/local/bin/bmake /usr/bin/make cd /usr/ports/ports-mgmt/pkg make -m /usr/share/mk UPGRADEPKG=1 install clean pkg2ng
To use ports after this, I have to run make -m /usr/share/mk instead of make.