cc -pthread  -Wall -Wextra -Werror=implicit-function-declaration stdlib/posix_memalign.c -o stdlib/posix_memalign -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE -lm -lpthread -lrt -lintl -liconv
stdlib/posix_memalign.c: In function ‘main’:
stdlib/posix_memalign.c:12:22: error: implicit declaration of function ‘posix_memalign’ [-Wimplicit-function-declaration]
   12 |         int errnum = posix_memalign(&ptr, 256, 768);
      |                      ^~~~~~~~~~~~~~
stdlib/posix_memalign.c:12:43: warning: ‘posix_memalign’ argument 2 type is ‘int’ where ‘long unsigned int’ is expected in a call to built-in function declared without prototype [-Wbuiltin-declaration-mismatch]
   12 |         int errnum = posix_memalign(&ptr, 256, 768);
      |                                           ^~~
<built-in>: note: built-in ‘posix_memalign’ declared here
stdlib/posix_memalign.c:12:48: warning: ‘posix_memalign’ argument 3 type is ‘int’ where ‘long unsigned int’ is expected in a call to built-in function declared without prototype [-Wbuiltin-declaration-mismatch]
   12 |         int errnum = posix_memalign(&ptr, 256, 768);
      |                                                ^~~
<built-in>: note: built-in ‘posix_memalign’ declared here