cc -pipe -O   -pthread  -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  -lrt -lcrypt
ftw/FTW_XDEV.c:8:17: error: 'FTW_XDEV' undeclared here (not in a function); did you mean 'FTW_DNR'?
 int const foo = FTW_XDEV;
                 ^~~~~~~~
                 FTW_DNR