Noteworthy changes in release 2.6.10 (2026-11-12) [stable]

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• A generated scanner compiles again where the C library's <stdio.h>
  does not define BUFSIZ, as in a freestanding build such as GRUB's.
  Flex 2.6.5 and later sized each read with BUFSIZ, so the scanner
  failed to compile there. It now uses BUFSIZ when it is defined and
  8192 when it is not, in both the default and the c99 back end. In
  the default back end, a definition of YY_READ_BUF_SIZE still takes
  precedence over both. (#851)

  Thanks to ojab.