https://github.com/dleonard0/pktstat/pull/6
https://bugs.gentoo.org/945321

--- a/resize.c
+++ b/resize.c
@@ -36,7 +36,7 @@
 #include "compat.h"
 
 #ifdef SIGWINCH
-static RETSIGTYPE sigwinch();
+static RETSIGTYPE sigwinch(int sig);
 #endif
 
 static volatile int sigwinch_seen;
@@ -44,8 +44,7 @@ static volatile int sigwinch_seen;
 #ifdef SIGWINCH
 /* Set the flag when the window size changes */
 static RETSIGTYPE
-sigwinch(sig)
-	int sig;
+sigwinch(int sig)
 {
 	sigwinch_seen = 1;
 }