[Bug 1824616] Re: Build succeeds despite flex/bison missing

[MarcH]

The warning was supposedly removed by
https://github.com/qemu/qemu/commit/67953a379ea5 /
https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg03980.html

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https://bugs.launchpad.net/bugs/1824616

Title:
  Build succeeds despite flex/bison missing

Status in QEMU:
  Incomplete

Bug description:
  I just built qemu using a fresh install, and "make" would report
  success despite messages of "flex: command not found" and "bison:
  command not found".

  I didn't notice any errors, but I don't know whether that's because
  there's a workaround in case the tools aren't there, or because I
  didn't exercize the code paths that would fail.

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