Put the rest of these into package.keywords and then unmerge your old ant-tasks and you should be good to go.

dev-java/ant
dev-java/ant-tasks
dev-java/ant-commons-net
dev-java/ant-nodeps
dev-java/ant-swing
dev-java/ant-jmf
dev-java/ant-apache-resolver
dev-java/ant-jsch
dev-java/ant-apache-bcel
dev-java/ant-junit
dev-java/ant-apache-oro
dev-java/ant-antlr
dev-java/ant-apache-log4j
dev-java/ant-apache-regexp
dev-java/jakarta-regexp
dev-java/ant-jdepend
dev-java/jdepend
dev-java/ant-apache-bsf
dev-java/bsf
dev-java/ant-commons-logging
dev-java/commons-logging
dev-java/ant-trax