cc -O2 -pipe  -pthread  -Wall -Wextra -Werror -Wno-error=deprecated -Wno-error=deprecated-declarations sys_types/pthread_attr_t.c -o sys_types/pthread_attr_t -D_POSIX_C_SOURCE=202405L  -lm -lpthread 
sys_types/pthread_attr_t.c:2:1: error: unknown type name 'pthread_attr_t'
pthread_attr_t* foo;
^
1 error generated.