Incomplete pkg-plistの意味がわかりません

# portupgrade -a
** Port marked as IGNORE: devel/pear-Console_Getopt:
"is marked as broken: Incomplete pkg-plist"
** Port marked as IGNORE: devel/pear-XML_RPC:
"is marked as broken: Incomplete pkg-plist"
** Port marked as IGNORE: archivers/pear-Archive_Tar:
"is marked as broken: Incomplete pkg-plist"
** Detected a package name change: xmbmon (sysutils/xmbmon) -> 'xmbmon-nox11' (sysutils/xmbmon)
** No need to upgrade 'xmbmon-205_1' (>= xmbmon-nox11-205_1). (specify -f to force)

Makefileの中をみてみますと
BROKEN= Incomplete pkg-plist
という記述があるのですがこの場合、
どのような意味になるんでしょうか