cc -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_shm/intptr_t.c -o sys_shm/intptr_t -D_POSIX_C_SOURCE=202405L -lm -lpthread -lrt -lcrypt -latomic
sys_shm/intptr_t.c:8:1: error: unknown type name ‘intptr_t’
    8 | intptr_t* foo;
      | ^~~~~~~~
sys_shm/intptr_t.c:8:1: note: ‘intptr_t’ is defined in header ‘<stdint.h>’; did you forget to ‘#include <stdint.h>’?
    7 | #include <sys/shm.h>
  +++ |+#include <stdint.h>
    8 | intptr_t* foo;