From a498d3b68b0457c27fb81e423661ef11fc30043d Mon Sep 17 00:00:00 2001
From: Benjamin Moody <benjaminmoody@gmail.com>
Date: Fri, 12 Mar 2021 16:10:19 -0500
Subject: [PATCH] visibility.c: fix incorrect use of printf.

To print to standard error, we must use fprintf(), not printf().
---
 visibility/src/visibility.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/visibility/src/visibility.c b/visibility/src/visibility.c
index 62d570a..232e94c 100644
--- a/visibility/src/visibility.c
+++ b/visibility/src/visibility.c
@@ -135,7 +135,7 @@ long input()
 		npts++;
 	}
 	if (npts < 1){
-		printf(stderr,"Error, no data read!");
+		fprintf(stderr,"Error, no data read!");
 		exit(-1);
 	}
 	return (npts);