ant-core versions 1.9.8 and 1.10.0 were released[1] on December 31st, 2016. It appears 1.9.8 relies on Java5 while 1.10.0 relies on Java8. [1] https://ant.apache.org/
in poly-c_overlay ant-core-1.10.0_pre.ebuild ant-core-1.10.1_pre.ebuild ant-core-1.9.8_pre.ebuild
*** This bug has been marked as a duplicate of bug 571110 ***