Use -b like the install scripts do.
Spotted by anton@.
-# $OpenBSD: Makefile,v 1.1 2020/03/12 15:40:39 visa Exp $
+# $OpenBSD: Makefile,v 1.2 2022/07/26 13:20:16 krw Exp $
REGRESS_SETUP= setup
REGRESS_CLEANUP= cleanup
mount_mfs -s1M -oasync swap /mnt/regress-vnd
dd if=/dev/zero of=/mnt/regress-vnd/disk.img count=1024
vnconfig vnd0 /mnt/regress-vnd/disk.img
- echo 'e 0\nC\n\n64\n960\nw\nq\n' | fdisk -e vnd0
+ fdisk -iy -b "960@64:0c" vnd0
newfs -t msdos vnd0i
REGRESS_ROOT_TARGETS= ${REGRESS_TARGETS}