Gentoo's Bugzilla –
Attachment 315631 Details for
Bug 421677dev-java/ant-commons-net-1.8.4 - *** Semantic Error: The abstract method "int compareTo(java.lang.Object $1);", inherited from type "java.lang.Comparable", is not implemented in the non-abstract class "org.apache.tools.ant.taskdefs.optional.net.FTP$