Related items: Upstream flex change: https://github.com/westes/flex/commit/f863c9490e6912ffcaeb12965fb3a567a10745ff
Upstream flex issue: https://github.com/westes/flex/issues/448 SDCC bug: https://sourceforge.net/p/sdcc/bugs/3012/ libguestfs also was affected: https://www.redhat.com/archives/libguestfs/2016-July/msg00252.html