[...]

Downloaded MacPorts base version 1.600

The MacPorts installation is not outdated and so was not updated
DEBUG: Setting ownership to root
selfupdate done!
twu4:~ mrilee$ sudo port clean --dist libxml2
--->  Cleaning libxml2
twu4:~ mrilee$ sudo port uninstall libxml2
Error: port uninstall failed: Registry error: libxml2 not registered as installed.
twu4:~ mrilee$ sudo port install libxml2
--->  Verifying checksum(s) for libxml2
Error: Target org.macports.checksum returned: Could not open file: /opt/local/var/macports/distfiles/libxml2/libxml2-2.6.32.tar.gz
Error: Status 1 encountered during processing.
twu4:~ mrilee$ 
twu4:~ mrilee$ sudo port -d install libxml2
DEBUG: Found port in file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/textproc/libxml2
DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/ports/textproc/libxml2
DEBUG: Requested variant darwin is not provided by port libxml2.
DEBUG: Requested variant i386 is not provided by port libxml2.
DEBUG: Requested variant macosx is not provided by port libxml2.
DEBUG: Found port in file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/textproc/libiconv
DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/ports/textproc/libiconv
DEBUG: Requested variant darwin is not provided by port libiconv.
DEBUG: Requested variant i386 is not provided by port libiconv.
DEBUG: Requested variant macosx is not provided by port libiconv.
DEBUG: Searching for dependency: libiconv
DEBUG: Found Dependency: receipt exists for libiconv
DEBUG: Found port in file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/archivers/zlib
DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/ports/archivers/zlib
DEBUG: Requested variant darwin is not provided by port zlib.
DEBUG: Requested variant i386 is not provided by port zlib.
DEBUG: Requested variant macosx is not provided by port zlib.
DEBUG: Searching for dependency: zlib
DEBUG: Found Dependency: receipt exists for zlib
DEBUG: Found port in file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/devel/libtool
DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/ports/devel/libtool
DEBUG: Requested variant darwin is not provided by port libtool.
DEBUG: Requested variant i386 is not provided by port libtool.
DEBUG: Requested variant macosx is not provided by port libtool.
DEBUG: Searching for dependency: libtool
DEBUG: Found Dependency: receipt exists for libtool
DEBUG: Skipping completed org.macports.main (libxml2)
DEBUG: Skipping completed org.macports.fetch (libxml2)
--->  Verifying checksum(s) for libxml2
DEBUG: Executing org.macports.checksum (libxml2)
--->  Checksumming libxml2-2.6.32.tar.gz
Error: Target org.macports.checksum returned: Could not open file: /opt/local/var/macports/distfiles/libxml2/libxml2-2.6.32.tar.gz
Warning: the following items did not execute (for libxml2): org.macports.activate org.macports.extract org.macports.checksum org.macports.patch org.macports.configure org.macports.build org.macports.destroot org.macports.install
Error: Status 1 encountered during processing.
twu4:~ mrilee$