cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration fcntl/posix_fallocate.c -o fcntl/posix_fallocate -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
fcntl/posix_fallocate.c: In function ‘main’:
fcntl/posix_fallocate.c:16:23: error: implicit declaration of function ‘posix_fallocate’ [-Wimplicit-function-declaration]
   16 |         if ( (errno = posix_fallocate(fileno(fp), 1, 2)) )
      |                       ^~~~~~~~~~~~~~~