EmptyGlobalAssignment: version 4.4.1-r1: line 22: empty global assignment: IUSE=""
  EmptyGlobalAssignment: version 5.2.0: line 22: empty global assignment: IUSE=""
  EmptyGlobalAssignment: version 5.3.1: line 22: empty global assignment: IUSE=""
  EmptyGlobalAssignment: version 5.4.0: line 22: empty global assignment: IUSE=""