Some weeks ago my weekly emerge -uvDa world ended in an error and since then Portage wouldn’t compile an update of jakarta-regex.

The emerge ended every time complaining that ant-core and ant-optional-tasks had different versions. dev-java/ant-tasks was not even installed and the try to do that ended in the same error message.

After weeks I found the solution: emerge –nodeps ant-tasks did the job and after that jakarta-regex could be updated too.