cc -pipe -O   -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  -lrt -lcrypt
sys_shm/intptr_t.c:8:1: error: unknown type name 'intptr_t'
 intptr_t* foo;
 ^~~~~~~~