https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92646
--- Comment #4 from Mysaa <samyavrillon at netcourrier dot com> --- There is two of them : bernard@pipi:~$ locate cdefs.h /home/bernard/building/gcc-9.2.0/fixincludes/tests/base/sys/cdefs.h /usr/include/arm-linux-gnueabihf/sys/cdefs.h bernard@pipi:~$