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--- a/tryip6.c
+++ b/tryip6.c
@@ -2,7 +2,7 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 
-main() {
+int main() {
   struct sockaddr_in6 sa;
   sa.sin6_family = PF_INET6;
 }