cc -O2 -pthread -I/usr/local/include  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations ftw/FTW_XDEV.c -o ftw/FTW_XDEV -D_POSIX_C_SOURCE=202405L  -lm -lpthread -lrt -L/usr/local/lib  -lintl -lcrypt
ftw/FTW_XDEV.c:8:17: error: 'FTW_XDEV' undeclared here (not in a function)
    8 | int const foo = FTW_XDEV;
      |                 ^~~~~~~~