cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration stdlib/reallocarray.c -o stdlib/reallocarray -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm -lpthread  -liconv
stdlib/reallocarray.c:16:12: error: call to undeclared function 'reallocarray'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   16 |         numbers = reallocarray(numbers, 16, sizeof(int));
      |                   ^
stdlib/reallocarray.c:16:10: error: incompatible integer to pointer conversion assigning to 'int *' from 'int' [-Wint-conversion]
   16 |         numbers = reallocarray(numbers, 16, sizeof(int));
      |                 ^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 errors generated.