ikiwiki fails to build: Compilation failed in require at (eval 30) line 2

[barracuda156]

PERL5LIB=.. ./po2wiki underlay.setup
Failed to load plugin IkiWiki::Plugin::po: Can't locate Locale/Po4a/Chooser.pm in @INC (@INC contains: .. /System/Library/Perl/5.8.8/darwin-thread-multi-2level /System/Library/Perl/5.8.8 /Library/Perl/5.8.8/darwin-thread-multi-2level /Library/Perl/5.8.8 /Library/Perl /Network/Library/Perl/5.8.8/darwin-thread-multi-2level /Network/Library/Perl/5.8.8 /Network/Library/Perl /System/Library/Perl/Extras/5.8.8/darwin-thread-multi-2level /System/Library/Perl/Extras/5.8.8 /Library/Perl/5.8.6 /Library/Perl/5.8.1 .) at ../IkiWiki/Plugin/po.pm line 19.
BEGIN failed--compilation aborted at ../IkiWiki/Plugin/po.pm line 19.
Compilation failed in require at (eval 30) line 2.
BEGIN failed--compilation aborted at (eval 30) line 2.

make[1]: *** [po2wiki_stamp] Error 2
make[1]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_www_ikiwiki/ikiwiki/work/IkiWiki-3.20190228/po'
make: *** [extra_build] Error 2