GnuBG doesn't build on Leopard

[macosforge@…]

Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_games_gnubg/work/gnubg-0.14.3" && make all " returned error 2
Command output:       _EvalInitialise in eval.o
      _EvalInitialise in eval.o
  "_ListDelete", referenced from:
      _PopGame in play.o
      _PopGame in play.o
      _PopMoveRecord in play.o
      _PopMoveRecord in play.o
      _NewGame in play.o
      _freeMP in matchequity.o
      _FreeList in sgf.o
      _FreeList in sgf.o
      _LoadCollection in sgf.o
      _CommandSavePosition in sgf.o
      _sgfparse in sgfp.o
      _GTKOutputX in gtkgame.o
      _ClearBuffer in gtktexi.o
      _Unload in gtktexi.o
      _EndElement in gtktexi.o
      _RenderNode in gtktexi.o
      _gtk_texi_render_node in gtktexi.o
      _gtk_texi_destroy in gtktexi.o
  "_CacheResize", referenced from:
      _EvalCacheResize in eval.o
  "_keyToLong", referenced from:
      _EvaluatePositionCubeful3 in eval.o
ld: symbol(s) not found
collect2: ld returned 1 exit status
make[2]: *** [gnubg] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

Error: Status 1 encountered during processing.