Fix compilation on OpenBSD
diff --git a/src/netops.c b/src/netops.c
index 401e283..fe95f2c 100644
--- a/src/netops.c
+++ b/src/netops.c
@@ -10,6 +10,7 @@
# include <sys/select.h>
# include <sys/time.h>
# include <netdb.h>
+# include <netinet/in.h>
# include <arpa/inet.h>
#else
# include <ws2tcpip.h>