[J65nko]

Originally Posted by bceverly

Thanks. I did a fresh install of 5.6 from the ISO image before doing this. Am I understanding you correctly that I first need to build "stable", then I can grab the current code and build from there?

No, as mentioned by Jggimi you need to install a binary snapshot of the OpenBSD current branch first.
For example from ftp://ftp.eu.openbsd.org/pub/OpenBSD/snapshots/amd64/

       46518 Apr  2 19:53 INSTALL.amd64
        1726 Apr  5 22:27 SHA256
        1889 Apr  5 22:28 SHA256.sig
    55890709 Apr  2 19:48 base57.tgz
     9951807 Apr  2 19:47 bsd
     9988254 Apr  2 19:47 bsd.mp
     7602926 Apr  2 19:53 bsd.rd
     7747584 Apr  2 19:53 cd57.iso
       71108 Apr  2 19:37 cdboot
        2048 Apr  2 19:37 cdbr
    51293032 Apr  2 19:48 comp57.tgz
     1474560 Apr  2 19:53 floppy57.fs
     2789749 Apr  2 19:48 game57.tgz
        1490 Apr  5 22:28 index.txt
   293601280 Apr  5 22:20 install57.fs
   227905536 Apr  5 22:20 install57.iso
     8968350 Apr  2 19:48 man57.tgz
     3571712 Apr  2 19:53 miniroot57.fs
       80996 Apr  2 19:37 pxeboot
    16972976 Apr  5 22:19 xbase57.tgz
    39930097 Apr  5 22:19 xfont57.tgz
    19794027 Apr  5 22:19 xserv57.tgz
     4512055 Apr  5 22:19 xshare57.tgz

On normal working days about 2 snapshots are being pushed to the ftp servers. With that rate I wonder why you would want to build from source