Não posso abrir o arquivo

 gcc 3.crash.c -o b -lpthread 

3.crash.c: In function ‘main’:
3.crash.c:41:7: warning: implicit declaration of function ‘pthread_create’ [-Wimplicit-function-declaration]
pthread_create(&t[count], NULL, quebra, (void *)&valor[count]);
^~~~~~~~~~~~~~
3.crash.c:45:7: warning: implicit declaration of function ‘pthread_join’ [-Wimplicit-function-declaration]
pthread_join(t[count], NULL);
^~~~~~~~~~~~
3.crash.c: In function ‘quebra’:
3.crash.c:96:33: warning: implicit declaration of function ‘pthread_exit’ [-Wimplicit-function-declaration]
pthread_exit(0);
^~~~~~~~~~~~

./b 

Nao posso abrir o arquivo

#include <pthread.h>



int main() {}

 

$ locate pthread.h

$ sudo apt-get install build-essential