This is the only K&R-style functions in the source, incompatible with C2x.
--- a/dcclib/inet_ntop.c
+++ b/dcclib/inet_ntop.c
@@ -88,7 +88,3 @@
  */
-static const char *
-inet_ntop4(src, dst, size)
-	const u_char *src;
-	char *dst;
-	size_t size;
+static const char *inet_ntop4(const u_char *src, char *dst, size_t size)
 {
@@ -115,7 +111,3 @@
  */
-static const char *
-inet_ntop6(src, dst, size)
-	const u_char *src;
-	char *dst;
-	size_t size;
+static const char *inet_ntop6(const u_char *src, char *dst, size_t size)
 {