EmptyGlobalAssignment: version 3.19.2: line 18: empty global assignment: IUSE=""
  EmptyGlobalAssignment: version 3.20.0: line 18: empty global assignment: IUSE=""
  EmptyGlobalAssignment: version 3.20.1: line 18: empty global assignment: IUSE=""
  EmptyGlobalAssignment: version 3.20.3: line 18: empty global assignment: IUSE=""