It looks like pipping@macports.org made a change to the zlib portfile a few hours ago, and now it is broken, at least on my MacBook:
$ port -v -d install zlib DEBUG: Found port in file:///opt/local/var/db/dports/sources/ rsync.rsync.darwinports.org_dpupdate_dports/archivers/zlib DEBUG: Changing to port directory: /opt/local/var/db/dports/sources/ rsync.rsync.darwinports.org_dpupdate_dports/archivers/zlib DEBUG: invalid command name "configure.universal_args" while executing "configure.universal_args ${configure.args}" (file "Portfile" line 30) invoked from within "source Portfile" invoked from within "$workername eval source Portfile" (procedure "dportopen" line 47) invoked from within "dportopen $porturl [array get options] [array get variations]" Error: Unable to open port: invalid command name "configure.universal_args"
Any ideas, or am I just missing something? Thanks, Chip