oping.h: #include <sys/types.h> so that `size_t' is defined.

diff --git a/src/oping.h b/src/oping.h
index 061aa5d..c013a50 100644 (file)
--- a/src/oping.h
+++ b/src/oping.h
@@ -30,6 +30,9 @@
 #if HAVE_UNISTD_H
 # include <unistd.h>
 #endif
+#if HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
 #if HAVE_SYS_SOCKET_H
 # include <sys/socket.h>
 #endif