Visual Studio error with 'timespec' structure

While executing a Pthread program in C using Visual Studio 2015, I got the following error: Error C2011 'timespec': 'struct' type redefinition The following is my code: ``` #include<pthread.h> #include<stdlib.h> #include<stdio.h> void *calculator(void *parameter); int main(/*int *argc,char *argv[]*/) { pthread_t thread_obj; pthread_attr_t thread_attr; char *First_string = "abc"/*argv[1]*/; pthread_attr_init(&thread_attr); pthread_create(&thread_obj,&thread_attr,calculator,First_string); } void *calculator(void *parameter) { int x=atoi((char*)parameter); printf("x=%d", x); } ```