diff --git a/lib/full-write.h b/lib/full-write.h
new file mode 100644
index 00000000..f23bccb5
--- /dev/null
+++ b/lib/full-write.h
@@ -0,0 +1,9 @@
+#ifndef PARAMS
+# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
+#  define PARAMS(Args) Args
+# else
+#  define PARAMS(Args) ()
+# endif
+#endif
+
+size_t full_write PARAMS ((int, const char *, size_t));