cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations ftw/FTW_DNR.c -o ftw/FTW_DNR -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lintl -liconv
ftw/FTW_DNR.c:7:10: fatal error: ftw.h: No such file or directory
    7 | #include <ftw.h>
      |          ^~~~~~~
compilation terminated.