I seem to have wrong Mac Ports after upgrading to Snow Leopard

I upgraded recently to Snow Leopard but used Time Machine wich was in Leopard. Time Machine asked to copy everything from old machine and I said yes.

How I seem to be having trouble installing Ruby because of the libraries and when I try to upgrade the Mac ports it fails although I installed the latest mac ports software.

Any ideas?

sudo port upgrade -d outdated
Warning: Skipping upgrade since ncursesw 5.7_0 >= ncursesw 5.7_0, even though installed variants "" do not match "+darwin_10". Use 'upgrade --enforce-variants' to switch to the requested variants.
Warning: Skipping upgrade since ncurses 5.7_0 >= ncurses 5.7_0, even though installed variants "" do not match "+darwin_10". Use 'upgrade --enforce-variants' to switch to the requested variants.
--->  Computing dependencies for apr-util

--->  Configuring apr-util
Error: Target org.macports.configure returned: configure failure: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_apr-util/work/apr-util-1.3.9" && ./configure --prefix=/opt/local --with-apr=/opt/local/bin/apr-1-config --with-expat=/opt/local --with-iconv=/opt/local --with-berkeley-db=/opt/local/include:/opt/local/lib/db46 --without-mysql --without-pgsql --with-sqlite3=/opt/local " returned error 1
Command output: checking for -ldb... no
checking for Berkeley DB 2 in /opt/local/include and /opt/local/lib/db46... 
checking db2/db.h usability... no
checking db2/db.h presence... no
checking for db2/db.h... no
checking db.h usability... yes
checking db.h presence... yes
checking for db.h... yes

checking for db_open in -ldb2... no
checking db2/db.h usability... no
checking db2/db.h presence... no
checking for db2/db.h... no
checking db.h usability... yes
checking db.h presence... yes
checking for db.h... yes
checking for db_open in -ldb... no
checking for Berkeley DB 1.0.0 in /opt/local/include and /opt/local/lib/db46... 
checking db1/db.h usability... no

checking db1/db.h presence... no
checking for db1/db.h... no
checking db.h usability... yes
checking db.h presence... yes
checking for db.h... yes
checking for dbopen in -ldb1... no
checking for Berkeley DB 1 in /opt/local/include and /opt/local/lib/db46... 
checking db_185.h usability... no
checking db_185.h presence... no
checking for db_185.h... no

checking for Berkeley DB... not found
configure: error: Berkeley DB not found.

Error: Unable to upgrade port: 1
Before reporting a bug, first run the command again with the -d flag to get complete output.

Answer

Do what it says and use the --enforce-variants option to rebuild your installed ports using the 10.6 default variants:

sudo port selfupdate

sudo port upgrade -u --enforce-variants installed

EDIT: If you haven't already, you will also probably need to install the MacPorts base files for 10.6 and then upgrade the ports. There are detailed instructions here.