flex 2.6.7

Noteworthy changes in release 2.6.7 (2026-11-11) [stable]

scanner

• A generated scanner now compiles when the program is built in a
  strict ISO C mode, such as -std=c99, with a compiler that treats a
  call to an undeclared function as an error (GCC 14 and later, Clang
  16 and later). Those modes hide a function the scanner needs to tell
  whether its input is a terminal, and the scanner now declares it
  itself. This also fixes "make check" failing in flex 2.6.6 with
  those compilers. (#845)

  Thanks to Philip Müller and K1ngfish3r for reporting it.