$ sudo port clean --all libical
--->  Cleaning libical
$ sudo port install libical
--->  Computing dependencies for libical
--->  Fetching libical
--->  Attempting to fetch libical-0.43.tar.gz from http://voxel.dl.sourceforge.net/freeassociation
--->  Verifying checksum(s) for libical
--->  Extracting libical
--->  Applying patches to libical
--->  Configuring libical
--->  Building libical
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_devel_libical/work/libical-0.43" && /usr/bin/make -j2 all " returned error 2
Command output:   "_icalparameter_get_cn", referenced from:
      _test_properties in access_properties_and_parameters.o
  "_icalparameter_new_cutype", referenced from:
      _create_new_component_with_va_args in access_components.o
      _create_new_component in access_components.o
  "_icalcomponent_add_component", referenced from:
      _create_new_component in access_components.o
  "_icalparser_add_line", referenced from:
      _parse_text in parse_text.o
  "_icalcomponent_isa", referenced from:
      _update_attendees in access_properties_and_parameters.o
      _get_required_attendees in access_properties_and_parameters.o
  "_icalproperty_get_next_parameter", referenced from:
      _test_properties in access_properties_and_parameters.o
  "_icalcomponent_free", referenced from:
      _parse_text in parse_text.o
  "_icalcomponent_count_errors", referenced from:
      _component_errors in errors.o
      _component_errors in errors.o
  "_icalproperty_vanew_dtstart", referenced from:
      _create_new_component_with_va_args in access_components.o
  "_icalcomponent_get_next_component", referenced from:
      _remove_vevent_sub_components in access_components.o
      _find_sub_components in access_components.o
      _find_sub_components in access_components.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[2]: *** [doesnothing] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Error: Status 1 encountered during processing.

Any ideas?

Thanks very much.