cc -O2 -pipe  -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 
sys_shm/intptr_t.c:8:1: error: unknown type name 'intptr_t'; did you mean '__intptr_t'?
intptr_t* foo;
^~~~~~~~
__intptr_t
/usr/include/machine/_types.h:103:16: note: '__intptr_t' declared here
typedef long                    __intptr_t;
                                ^
1 error generated.