--- OLD/generator.c	Thu Jan  1 00:00:00 1970
+++ NEW/generator.c	Thu Jan  1 00:00:00 1970
@@ -189,8 +189,8 @@
 
 		if (verbose > 3) {
 			rprintf(FINFO,
-				"chunk[%d] offset=%.0f len=%d sum1=%08lx\n",
-				i, (double) offset, n1, (unsigned long) sum1);
+				"chunk[%lu] offset=%.0f len=%d sum1=%08lx\n",
+				(unsigned long int) i, (double) offset, n1, (unsigned long) sum1);
 		}
 		write_int(f_out, sum1);
 		write_buf(f_out, sum2, csum_length);