The current portage tree for ant cannot build as ant-core-1.6.5-r1 is blocking ant-tasks 1.6.5 [blocks B ] <dev-java/ant-tasks-1.6.5 (is blocking dev-java/ant-core-1.6.5-r1) [ebuild U ] dev-perl/DBD-Pg-1.43 [1.22] [ebuild U ] media-sound/xmms-1.2.10-r15 [1.2.10-r14] [ebuild U ] dev-java/ant-core-1.6.5-r1 [1.6.2-r3] [ebuild U ] dev-java/ant-tasks-1.6.5 [1.6.2-r9] [ebuild U ] dev-java/ant-1.6.5 [1.6.2-r6] [ebuild U ] dev-util/eclipse-sdk-3.1-r1 [3.1]
Unmerge ant-tasks first.