diff -pru libpng-1.6.37/contrib/gregbook/readpng.c libpng-1.6.37-fixed/contrib/gregbook/readpng.c
--- libpng-1.6.37/contrib/gregbook/readpng.c	2019-04-14 11:10:32.000000000 -0700
+++ libpng-1.6.37-fixed/contrib/gregbook/readpng.c	2019-08-23 12:14:13.106180379 -0700
@@ -266,7 +266,7 @@ uch *readpng_get_image(double display_ex

     /* Guard against integer overflow */
     if (height > ((size_t)(-1))/rowbytes) {
-        fprintf(stderr, "readpng:  image_data buffer would be too large\n",
+        fprintf(stderr, "readpng:  image_data buffer would be too large\n");
         return NULL;
     }