mtgto/dispatch.c

## dispatch.c
#include <dispatch/dispatch.h>

int main() {
  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{puts("gcd! gcd!");});
  sleep(1);
}

## gistfile1.sh
clang dispatch.c -o dispatch -fblocks -ldispatch -lBlocksRuntime
	#include <dispatch/dispatch.h>

	int main() {
	dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{puts("gcd! gcd!");});
	sleep(1);
	}