Build look(1) with WARNS=6.

usr.bin/look/Makefile

@@ -3,6 +3,4 @@
 
 PROG=	look
 
-WARNS?=	2
-
 .include <bsd.prog.mk>

usr.bin/look/look.c

@@ -134,7 +134,7 @@ main(int argc, char *argv[])
 	do {
 		if ((fd = open(file, O_RDONLY, 0)) < 0 || fstat(fd, &sb))
 			err(2, "%s", file);
-		if (sb.st_size > SIZE_T_MAX)
+		if (sb.st_size > (off_t)SIZE_T_MAX)
 			errx(2, "%s: %s", file, strerror(EFBIG));
 		if (sb.st_size == 0) {
 			close(fd);